includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  */
   5
   6 /**
   7  * Class representing a MediaWiki article and history.
   8  *
   9  * See design.txt for an overview.
  10  * Note: edit user interface and cache support functions have been
  11  * moved to separate EditPage and HTMLFileCache classes.
  12  *
  13  */
  14 class Article {
  15         /**@{{
  16          * @private
  17          */
  18         var $mComment;                  //!<
  19         var $mContent;                  //!<
  20         var $mContentLoaded;    //!<
  21         var $mCounter;                  //!<
  22         var $mForUpdate;                //!<
  23         var $mGoodAdjustment;   //!<
  24         var $mLatest;                   //!<
  25         var $mMinorEdit;                //!<
  26         var $mOldId;                    //!<
  27         var $mRedirectedFrom;   //!<
  28         var $mRedirectUrl;              //!<
  29         var $mRevIdFetched;             //!<
  30         var $mRevision;                 //!<
  31         var $mTimestamp;                //!<
  32         var $mTitle;                    //!<
  33         var $mTotalAdjustment;  //!<
  34         var $mTouched;                  //!<
  35         var $mUser;                             //!<
  36         var $mUserText;                 //!<
  37         var $mRedirectTarget;           //!<
  38         /**@}}*/
  39
  40         /**
  41          * Constructor and clear the article
  42          * @param $title Reference to a Title object.
  43          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  44          */
  45         function __construct( Title $title, $oldId = null ) {
  46                 $this->mTitle =& $title;
  47                 $this->mOldId = $oldId;
  48                 $this->clear();
  49         }
  50
  51         /**
  52          * Tell the page view functions that this view was redirected
  53          * from another page on the wiki.
  54          * @param $from Title object.
  55          */
  56         function setRedirectedFrom( $from ) {
  57                 $this->mRedirectedFrom = $from;
  58         }
  59
  60         /**
  61          * If this page is a redirect, get its target
  62          *
  63          * The target will be fetched from the redirect table if possible.
  64          * If this page doesn't have an entry there, call insertRedirect()
  65          * @return mixed Title object, or null if this page is not a redirect
  66          */
  67         public function getRedirectTarget() {
  68                 if(!$this->mTitle || !$this->mTitle->isRedirect())
  69                         return null;
  70                 if(!is_null($this->mRedirectTarget))
  71                         return $this->mRedirectTarget;
  72
  73                 # Query the redirect table
  74                 $dbr = wfGetDB(DB_SLAVE);
  75                 $res = $dbr->select('redirect',
  76                                 array('rd_namespace', 'rd_title'),
  77                                 array('rd_from' => $this->getID()),
  78                                 __METHOD__
  79                 );
  80                 $row = $dbr->fetchObject($res);
  81                 if($row)
  82                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  83
  84                 # This page doesn't have an entry in the redirect table
  85                 return $this->mRedirectTarget = $this->insertRedirect();
  86         }
  87
  88         /**
  89          * Insert an entry for this page into the redirect table.
  90          *
  91          * Don't call this function directly unless you know what you're doing.
  92          * @return Title object
  93          */
  94         public function insertRedirect() {
  95                 $retval = Title::newFromRedirect($this->getContent());
  96                 if(!$retval)
  97                         return null;
  98                 $dbw = wfGetDB(DB_MASTER);
  99                 $dbw->insert('redirect', array(
 100                                 'rd_from' => $this->getID(),
 101                                 'rd_namespace' => $retval->getNamespace(),
 102                                 'rd_title' => $retval->getDBKey()
 103                 ));
 104                 return $retval;
 105         }
 106
 107         /**
 108          * Get the Title object this page redirects to
 109          *
 110          * @param bool $getFragment should the fragment be set on the title
 111          * @return mixed false, Title of in-wiki target, or string with URL
 112          */
 113         function followRedirect( $getFragment = false ) {
 114                 if( $getFragment )
 115                         // We'll need to use the content of this page, as Article::getRedirectTarget()
 116                         // now loads the data from redirect table, wich doesn't store the fragment
 117                         $rt = Title::newFromRedirect( $this->getContent() );
 118                 else
 119                         $rt = $this->getRedirectTarget();
 120
 121                 # process if title object is valid and not special:userlogout
 122                 if( $rt ) {
 123                         if( $rt->getInterwiki() != '' ) {
 124                                 if( $rt->isLocal() ) {
 125                                         // Offsite wikis need an HTTP redirect.
 126                                         //
 127                                         // This can be hard to reverse and may produce loops,
 128                                         // so they may be disabled in the site configuration.
 129
 130                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 131                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 132                                 }
 133                         } else {
 134                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 135                                         // Gotta handle redirects to special pages differently:
 136                                         // Fill the HTTP response "Location" header and ignore
 137                                         // the rest of the page we're on.
 138                                         //
 139                                         // This can be hard to reverse, so they may be disabled.
 140
 141                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 142                                                 // rolleyes
 143                                         } else {
 144                                                 return $rt->getFullURL();
 145                                         }
 146                                 }
 147                                 return $rt;
 148                         }
 149                 }
 150
 151                 // No or invalid redirect
 152                 return false;
 153         }
 154
 155         /**
 156          * get the title object of the article
 157          */
 158         function getTitle() {
 159                 return $this->mTitle;
 160         }
 161
 162         /**
 163           * Clear the object
 164           * @private
 165           */
 166         function clear() {
 167                 $this->mDataLoaded    = false;
 168                 $this->mContentLoaded = false;
 169
 170                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 171                 $this->mRedirectedFrom = null; # Title object if set
 172                 $this->mRedirectTarget = null; # Title object if set
 173                 $this->mUserText =
 174                 $this->mTimestamp = $this->mComment = '';
 175                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 176                 $this->mTouched = '19700101000000';
 177                 $this->mForUpdate = false;
 178                 $this->mIsRedirect = false;
 179                 $this->mRevIdFetched = 0;
 180                 $this->mRedirectUrl = false;
 181                 $this->mLatest = false;
 182                 $this->mPreparedEdit = false;
 183         }
 184
 185         /**
 186          * Note that getContent/loadContent do not follow redirects anymore.
 187          * If you need to fetch redirectable content easily, try
 188          * the shortcut in Article::followContent()
 189          * FIXME
 190          * @todo There are still side-effects in this!
 191          *        In general, you should use the Revision class, not Article,
 192          *        to fetch text for purposes other than page views.
 193          *
 194          * @return Return the text of this revision
 195         */
 196         function getContent() {
 197                 global $wgUser, $wgOut, $wgMessageCache;
 198
 199                 wfProfileIn( __METHOD__ );
 200
 201                 if ( 0 == $this->getID() ) {
 202                         wfProfileOut( __METHOD__ );
 203                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 204
 205                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 206                                 $wgMessageCache->loadAllMessages();
 207                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 208                         } else {
 209                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 210                         }
 211
 212                         return "<div class='noarticletext'>\n$ret\n</div>";
 213                 } else {
 214                         $this->loadContent();
 215                         wfProfileOut( __METHOD__ );
 216                         return $this->mContent;
 217                 }
 218         }
 219
 220         /**
 221          * This function returns the text of a section, specified by a number ($section).
 222          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 223          * the first section before any such heading (section 0).
 224          *
 225          * If a section contains subsections, these are also returned.
 226          *
 227          * @param $text String: text to look in
 228          * @param $section Integer: section number
 229          * @return string text of the requested section
 230          * @deprecated
 231          */
 232         function getSection($text,$section) {
 233                 global $wgParser;
 234                 return $wgParser->getSection( $text, $section );
 235         }
 236
 237         /**
 238          * @return int The oldid of the article that is to be shown, 0 for the
 239          *             current revision
 240          */
 241         function getOldID() {
 242                 if ( is_null( $this->mOldId ) ) {
 243                         $this->mOldId = $this->getOldIDFromRequest();
 244                 }
 245                 return $this->mOldId;
 246         }
 247
 248         /**
 249          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 250          *
 251          * @return int The old id for the request
 252          */
 253         function getOldIDFromRequest() {
 254                 global $wgRequest;
 255                 $this->mRedirectUrl = false;
 256                 $oldid = $wgRequest->getVal( 'oldid' );
 257                 if ( isset( $oldid ) ) {
 258                         $oldid = intval( $oldid );
 259                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 260                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 261                                 if ( $nextid  ) {
 262                                         $oldid = $nextid;
 263                                 } else {
 264                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 265                                 }
 266                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 267                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 268                                 if ( $previd ) {
 269                                         $oldid = $previd;
 270                                 } else {
 271                                         # TODO
 272                                 }
 273                         }
 274                         # unused:
 275                         # $lastid = $oldid;
 276                 }
 277
 278                 if ( !$oldid ) {
 279                         $oldid = 0;
 280                 }
 281                 return $oldid;
 282         }
 283
 284         /**
 285          * Load the revision (including text) into this object
 286          */
 287         function loadContent() {
 288                 if ( $this->mContentLoaded ) return;
 289
 290                 # Query variables :P
 291                 $oldid = $this->getOldID();
 292
 293                 # Pre-fill content with error message so that if something
 294                 # fails we'll have something telling us what we intended.
 295                 $this->mOldId = $oldid;
 296                 $this->fetchContent( $oldid );
 297         }
 298
 299
 300         /**
 301          * Fetch a page record with the given conditions
 302          * @param Database $dbr
 303          * @param array    $conditions
 304          * @private
 305          */
 306         function pageData( $dbr, $conditions ) {
 307                 $fields = array(
 308                                 'page_id',
 309                                 'page_namespace',
 310                                 'page_title',
 311                                 'page_restrictions',
 312                                 'page_counter',
 313                                 'page_is_redirect',
 314                                 'page_is_new',
 315                                 'page_random',
 316                                 'page_touched',
 317                                 'page_latest',
 318                                 'page_len',
 319                 );
 320                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 321                 $row = $dbr->selectRow(
 322                         'page',
 323                         $fields,
 324                         $conditions,
 325                         __METHOD__
 326                 );
 327                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 328                 return $row ;
 329         }
 330
 331         /**
 332          * @param Database $dbr
 333          * @param Title $title
 334          */
 335         function pageDataFromTitle( $dbr, $title ) {
 336                 return $this->pageData( $dbr, array(
 337                         'page_namespace' => $title->getNamespace(),
 338                         'page_title'     => $title->getDBkey() ) );
 339         }
 340
 341         /**
 342          * @param Database $dbr
 343          * @param int $id
 344          */
 345         function pageDataFromId( $dbr, $id ) {
 346                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 347         }
 348
 349         /**
 350          * Set the general counter, title etc data loaded from
 351          * some source.
 352          *
 353          * @param object $data
 354          * @private
 355          */
 356         function loadPageData( $data = 'fromdb' ) {
 357                 if ( $data === 'fromdb' ) {
 358                         $dbr = $this->getDB();
 359                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 360                 }
 361
 362                 $lc = LinkCache::singleton();
 363                 if ( $data ) {
 364                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 365
 366                         $this->mTitle->mArticleID = $data->page_id;
 367
 368                         # Old-fashioned restrictions.
 369                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 370
 371                         $this->mCounter     = $data->page_counter;
 372                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 373                         $this->mIsRedirect  = $data->page_is_redirect;
 374                         $this->mLatest      = $data->page_latest;
 375                 } else {
 376                         if ( is_object( $this->mTitle ) ) {
 377                                 $lc->addBadLinkObj( $this->mTitle );
 378                         }
 379                         $this->mTitle->mArticleID = 0;
 380                 }
 381
 382                 $this->mDataLoaded  = true;
 383         }
 384
 385         /**
 386          * Get text of an article from database
 387          * Does *NOT* follow redirects.
 388          * @param int $oldid 0 for whatever the latest revision is
 389          * @return string
 390          */
 391         function fetchContent( $oldid = 0 ) {
 392                 if ( $this->mContentLoaded ) {
 393                         return $this->mContent;
 394                 }
 395
 396                 $dbr = $this->getDB();
 397
 398                 # Pre-fill content with error message so that if something
 399                 # fails we'll have something telling us what we intended.
 400                 $t = $this->mTitle->getPrefixedText();
 401                 if( $oldid ) {
 402                         $t .= ',oldid='.$oldid;
 403                 }
 404                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 405
 406                 if( $oldid ) {
 407                         $revision = Revision::newFromId( $oldid );
 408                         if( is_null( $revision ) ) {
 409                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 410                                 return false;
 411                         }
 412                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 413                         if( !$data ) {
 414                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 415                                 return false;
 416                         }
 417                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 418                         $this->loadPageData( $data );
 419                 } else {
 420                         if( !$this->mDataLoaded ) {
 421                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 422                                 if( !$data ) {
 423                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 424                                         return false;
 425                                 }
 426                                 $this->loadPageData( $data );
 427                         }
 428                         $revision = Revision::newFromId( $this->mLatest );
 429                         if( is_null( $revision ) ) {
 430                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 431                                 return false;
 432                         }
 433                 }
 434
 435                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 436                 // We should instead work with the Revision object when we need it...
 437                 $this->mContent   = $revision->revText(); // Loads if user is allowed
 438
 439                 $this->mUser      = $revision->getUser();
 440                 $this->mUserText  = $revision->getUserText();
 441                 $this->mComment   = $revision->getComment();
 442                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 443
 444                 $this->mRevIdFetched = $revision->getID();
 445                 $this->mContentLoaded = true;
 446                 $this->mRevision =& $revision;
 447
 448                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 449
 450                 return $this->mContent;
 451         }
 452
 453         /**
 454          * Read/write accessor to select FOR UPDATE
 455          *
 456          * @param $x Mixed: FIXME
 457          */
 458         function forUpdate( $x = NULL ) {
 459                 return wfSetVar( $this->mForUpdate, $x );
 460         }
 461
 462         /**
 463          * Get the database which should be used for reads
 464          *
 465          * @return Database
 466          */
 467         function getDB() {
 468                 return wfGetDB( DB_MASTER );
 469         }
 470
 471         /**
 472          * Get options for all SELECT statements
 473          *
 474          * @param $options Array: an optional options array which'll be appended to
 475          *                       the default
 476          * @return Array: options
 477          */
 478         function getSelectOptions( $options = '' ) {
 479                 if ( $this->mForUpdate ) {
 480                         if ( is_array( $options ) ) {
 481                                 $options[] = 'FOR UPDATE';
 482                         } else {
 483                                 $options = 'FOR UPDATE';
 484                         }
 485                 }
 486                 return $options;
 487         }
 488
 489         /**
 490          * @return int Page ID
 491          */
 492         function getID() {
 493                 if( $this->mTitle ) {
 494                         return $this->mTitle->getArticleID();
 495                 } else {
 496                         return 0;
 497                 }
 498         }
 499
 500         /**
 501          * @return bool Whether or not the page exists in the database
 502          */
 503         function exists() {
 504                 return $this->getId() != 0;
 505         }
 506
 507         /**
 508          * @return int The view count for the page
 509          */
 510         function getCount() {
 511                 if ( -1 == $this->mCounter ) {
 512                         $id = $this->getID();
 513                         if ( $id == 0 ) {
 514                                 $this->mCounter = 0;
 515                         } else {
 516                                 $dbr = wfGetDB( DB_SLAVE );
 517                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 518                                         'Article::getCount', $this->getSelectOptions() );
 519                         }
 520                 }
 521                 return $this->mCounter;
 522         }
 523
 524         /**
 525          * Determine whether a page  would be suitable for being counted as an
 526          * article in the site_stats table based on the title & its content
 527          *
 528          * @param $text String: text to analyze
 529          * @return bool
 530          */
 531         function isCountable( $text ) {
 532                 global $wgUseCommaCount;
 533
 534                 $token = $wgUseCommaCount ? ',' : '[[';
 535                 return
 536                         $this->mTitle->isContentPage()
 537                         && !$this->isRedirect( $text )
 538                         && in_string( $token, $text );
 539         }
 540
 541         /**
 542          * Tests if the article text represents a redirect
 543          *
 544          * @param $text String: FIXME
 545          * @return bool
 546          */
 547         function isRedirect( $text = false ) {
 548                 if ( $text === false ) {
 549                         $this->loadContent();
 550                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 551                 } else {
 552                         $titleObj = Title::newFromRedirect( $text );
 553                 }
 554                 return $titleObj !== NULL;
 555         }
 556
 557         /**
 558          * Returns true if the currently-referenced revision is the current edit
 559          * to this page (and it exists).
 560          * @return bool
 561          */
 562         function isCurrent() {
 563                 # If no oldid, this is the current version.
 564                 if ($this->getOldID() == 0)
 565                         return true;
 566
 567                 return $this->exists() &&
 568                         isset( $this->mRevision ) &&
 569                         $this->mRevision->isCurrent();
 570         }
 571
 572         /**
 573          * Loads everything except the text
 574          * This isn't necessary for all uses, so it's only done if needed.
 575          * @private
 576          */
 577         function loadLastEdit() {
 578                 if ( -1 != $this->mUser )
 579                         return;
 580
 581                 # New or non-existent articles have no user information
 582                 $id = $this->getID();
 583                 if ( 0 == $id ) return;
 584
 585                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 586                 if( !is_null( $this->mLastRevision ) ) {
 587                         $this->mUser      = $this->mLastRevision->getUser();
 588                         $this->mUserText  = $this->mLastRevision->getUserText();
 589                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 590                         $this->mComment   = $this->mLastRevision->getComment();
 591                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 592                         $this->mRevIdFetched = $this->mLastRevision->getID();
 593                 }
 594         }
 595
 596         function getTimestamp() {
 597                 // Check if the field has been filled by ParserCache::get()
 598                 if ( !$this->mTimestamp ) {
 599                         $this->loadLastEdit();
 600                 }
 601                 return wfTimestamp(TS_MW, $this->mTimestamp);
 602         }
 603
 604         function getUser() {
 605                 $this->loadLastEdit();
 606                 return $this->mUser;
 607         }
 608
 609         function getUserText() {
 610                 $this->loadLastEdit();
 611                 return $this->mUserText;
 612         }
 613
 614         function getComment() {
 615                 $this->loadLastEdit();
 616                 return $this->mComment;
 617         }
 618
 619         function getMinorEdit() {
 620                 $this->loadLastEdit();
 621                 return $this->mMinorEdit;
 622         }
 623
 624         function getRevIdFetched() {
 625                 $this->loadLastEdit();
 626                 return $this->mRevIdFetched;
 627         }
 628
 629         /**
 630          * @todo Document, fixme $offset never used.
 631          * @param $limit Integer: default 0.
 632          * @param $offset Integer: default 0.
 633          */
 634         function getContributors($limit = 0, $offset = 0) {
 635                 # XXX: this is expensive; cache this info somewhere.
 636
 637                 $contribs = array();
 638                 $dbr = wfGetDB( DB_SLAVE );
 639                 $revTable = $dbr->tableName( 'revision' );
 640                 $userTable = $dbr->tableName( 'user' );
 641                 $user = $this->getUser();
 642                 $pageId = $this->getId();
 643
 644                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 645                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 646                         WHERE rev_page = $pageId
 647                         AND rev_user != $user
 648                         GROUP BY rev_user, rev_user_text, user_real_name
 649                         ORDER BY timestamp DESC";
 650
 651                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 652                 $sql .= ' '. $this->getSelectOptions();
 653
 654                 $res = $dbr->query($sql, __METHOD__);
 655
 656                 while ( $line = $dbr->fetchObject( $res ) ) {
 657                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 658                 }
 659
 660                 $dbr->freeResult($res);
 661                 return $contribs;
 662         }
 663
 664         /**
 665          * This is the default action of the script: just view the page of
 666          * the given title.
 667         */
 668         function view() {
 669                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 670                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 671                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 672                 global $wgDefaultRobotPolicy;
 673                 $sk = $wgUser->getSkin();
 674
 675                 wfProfileIn( __METHOD__ );
 676
 677                 $parserCache = ParserCache::singleton();
 678                 $ns = $this->mTitle->getNamespace(); # shortcut
 679
 680                 # Get variables from query string
 681                 $oldid = $this->getOldID();
 682
 683                 # getOldID may want us to redirect somewhere else
 684                 if ( $this->mRedirectUrl ) {
 685                         $wgOut->redirect( $this->mRedirectUrl );
 686                         wfProfileOut( __METHOD__ );
 687                         return;
 688                 }
 689
 690                 $diff = $wgRequest->getVal( 'diff' );
 691                 $rcid = $wgRequest->getVal( 'rcid' );
 692                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 693                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 694                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 695
 696                 $wgOut->setArticleFlag( true );
 697
 698                 # Discourage indexing of printable versions, but encourage following
 699                 if( $wgOut->isPrintable() ) {
 700                         $policy = 'noindex,follow';
 701                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 702                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 703                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 704                         # Honour customised robot policies for this namespace
 705                         $policy = $wgNamespaceRobotPolicies[$ns];
 706                 } else {
 707                         $policy = $wgDefaultRobotPolicy;
 708                 }
 709                 $wgOut->setRobotPolicy( $policy );
 710
 711                 # If we got diff and oldid in the query, we want to see a
 712                 # diff page instead of the article.
 713
 714                 if ( !is_null( $diff ) ) {
 715                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 716
 717                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge );
 718                         // DifferenceEngine directly fetched the revision:
 719                         $this->mRevIdFetched = $de->mNewid;
 720                         $de->showDiffPage( $diffOnly );
 721
 722                         // Needed to get the page's current revision
 723                         $this->loadPageData();
 724                         if( $diff == 0 || $diff == $this->mLatest ) {
 725                                 # Run view updates for current revision only
 726                                 $this->viewUpdates();
 727                         }
 728                         wfProfileOut( __METHOD__ );
 729                         return;
 730                 }
 731
 732                 if ( empty( $oldid ) && $this->checkTouched() ) {
 733                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 734
 735                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 736                                 wfProfileOut( __METHOD__ );
 737                                 return;
 738                         } else if ( $this->tryFileCache() ) {
 739                                 # tell wgOut that output is taken care of
 740                                 $wgOut->disable();
 741                                 $this->viewUpdates();
 742                                 wfProfileOut( __METHOD__ );
 743                                 return;
 744                         }
 745                 }
 746
 747                 # Should the parser cache be used?
 748                 $pcache = $wgEnableParserCache
 749                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 750                         && $this->exists()
 751                         && empty( $oldid )
 752                         && !$this->mTitle->isCssOrJsPage()
 753                         && !$this->mTitle->isCssJsSubpage();
 754                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 755                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 756                         wfIncrStats( 'pcache_miss_stub' );
 757                 }
 758
 759                 $wasRedirected = false;
 760                 if ( isset( $this->mRedirectedFrom ) ) {
 761                         // This is an internally redirected page view.
 762                         // We'll need a backlink to the source page for navigation.
 763                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 764                                 $sk = $wgUser->getSkin();
 765                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 766                                 $s = wfMsg( 'redirectedfrom', $redir );
 767                                 $wgOut->setSubtitle( $s );
 768
 769                                 // Set the fragment if one was specified in the redirect
 770                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 771                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 772                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 773                                 }
 774                                 $wasRedirected = true;
 775                         }
 776                 } elseif ( !empty( $rdfrom ) ) {
 777                         // This is an externally redirected view, from some other wiki.
 778                         // If it was reported from a trusted site, supply a backlink.
 779                         global $wgRedirectSources;
 780                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 781                                 $sk = $wgUser->getSkin();
 782                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 783                                 $s = wfMsg( 'redirectedfrom', $redir );
 784                                 $wgOut->setSubtitle( $s );
 785                                 $wasRedirected = true;
 786                         }
 787                 }
 788
 789                 $outputDone = false;
 790                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 791                 if ( $pcache ) {
 792                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 793                                 // Ensure that UI elements requiring revision ID have
 794                                 // the correct version information.
 795                                 $wgOut->setRevisionId( $this->mLatest );
 796                                 $outputDone = true;
 797                         }
 798                 }
 799                 if ( !$outputDone ) {
 800                         $text = $this->getContent();
 801                         if ( $text === false ) {
 802                                 # Failed to load, replace text with error message
 803                                 $t = $this->mTitle->getPrefixedText();
 804                                 if( $oldid ) {
 805                                         $t .= ',oldid='.$oldid;
 806                                         $text = wfMsg( 'missingarticle', $t );
 807                                 } else {
 808                                         $text = wfMsg( 'noarticletext', $t );
 809                                 }
 810                         }
 811
 812                         # Another whitelist check in case oldid is altering the title
 813                         if ( !$this->mTitle->userCanRead() ) {
 814                                 $wgOut->loginToUse();
 815                                 $wgOut->output();
 816                                 exit;
 817                         }
 818
 819                         # We're looking at an old revision
 820
 821                         if ( !empty( $oldid ) ) {
 822                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 823                                 if( is_null( $this->mRevision ) ) {
 824                                         // FIXME: This would be a nice place to load the 'no such page' text.
 825                                 } else {
 826                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 827                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 828                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 829                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 830                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 831                                                         return;
 832                                                 } else {
 833                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 834                                                         // and we are allowed to see...
 835                                                 }
 836                                         }
 837                                 }
 838
 839                         }
 840                 }
 841                 if( !$outputDone ) {
 842                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 843
 844                          // Pages containing custom CSS or JavaScript get special treatment
 845                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 846                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 847
 848                                 // Give hooks a chance to customise the output
 849                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 850                                         // Wrap the whole lot in a <pre> and don't parse
 851                                         $m = array();
 852                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 853                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 854                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 855                                         $wgOut->addHtml( "\n</pre>\n" );
 856                                 }
 857
 858                         }
 859
 860                         elseif ( $rt = $this->getRedirectTarget() ) {
 861                                 # Display redirect
 862                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 863                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 864                                 # Don't overwrite the subtitle if this was an old revision
 865                                 if( !$wasRedirected && $this->isCurrent() ) {
 866                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 867                                 }
 868                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 869
 870                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 871                                   '<span class="redirectText">'.$link.'</span>' );
 872
 873                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 874                                 $wgOut->addParserOutputNoText( $parseout );
 875                         } else if ( $pcache ) {
 876                                 # Display content and save to parser cache
 877                                 $this->outputWikiText( $text );
 878                         } else {
 879                                 # Display content, don't attempt to save to parser cache
 880                                 # Don't show section-edit links on old revisions... this way lies madness.
 881                                 if( !$this->isCurrent() ) {
 882                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 883                                 }
 884                                 # Display content and don't save to parser cache
 885                                 # With timing hack -- TS 2006-07-26
 886                                 $time = -wfTime();
 887                                 $this->outputWikiText( $text, false );
 888                                 $time += wfTime();
 889
 890                                 # Timing hack
 891                                 if ( $time > 3 ) {
 892                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 893                                                 $this->mTitle->getPrefixedDBkey()));
 894                                 }
 895
 896                                 if( !$this->isCurrent() ) {
 897                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 898                                 }
 899
 900                         }
 901                 }
 902                 /* title may have been set from the cache */
 903                 $t = $wgOut->getPageTitle();
 904                 if( empty( $t ) ) {
 905                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 906                 }
 907
 908                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 909                 if( $ns == NS_USER_TALK &&
 910                         IP::isValid( $this->mTitle->getText() ) ) {
 911                         $wgOut->addWikiMsg('anontalkpagetext');
 912                 }
 913
 914                 # If we have been passed an &rcid= parameter, we want to give the user a
 915                 # chance to mark this new article as patrolled.
 916                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 917                         $wgOut->addHTML(
 918                                 "<div class='patrollink'>" .
 919                                         wfMsgHtml( 'markaspatrolledlink',
 920                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 921                                                 "action=markpatrolled&rcid=$rcid" )
 922                                         ) .
 923                                 '</div>'
 924                          );
 925                 }
 926
 927                 # Trackbacks
 928                 if ($wgUseTrackbacks)
 929                         $this->addTrackbacks();
 930
 931                 $this->viewUpdates();
 932                 wfProfileOut( __METHOD__ );
 933         }
 934
 935         function addTrackbacks() {
 936                 global $wgOut, $wgUser;
 937
 938                 $dbr = wfGetDB(DB_SLAVE);
 939                 $tbs = $dbr->select(
 940                                 /* FROM   */ 'trackbacks',
 941                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 942                                 /* WHERE  */ array('tb_page' => $this->getID())
 943                 );
 944
 945                 if (!$dbr->numrows($tbs))
 946                         return;
 947
 948                 $tbtext = "";
 949                 while ($o = $dbr->fetchObject($tbs)) {
 950                         $rmvtxt = "";
 951                         if ($wgUser->isAllowed( 'trackback' )) {
 952                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 953                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 954                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 955                         }
 956                         $tbtext .= "\n";
 957                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 958                                         $o->tb_title,
 959                                         $o->tb_url,
 960                                         $o->tb_ex,
 961                                         $o->tb_name,
 962                                         $rmvtxt);
 963                 }
 964                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
 965         }
 966
 967         function deletetrackback() {
 968                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 969
 970                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 971                         $wgOut->addWikiMsg( 'sessionfailure' );
 972                         return;
 973                 }
 974
 975                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
 976
 977                 if (count($permission_errors)>0)
 978                 {
 979                         $wgOut->showPermissionsErrorPage( $permission_errors );
 980                         return;
 981                 }
 982
 983                 $db = wfGetDB(DB_MASTER);
 984                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 985                 $wgTitle->invalidateCache();
 986                 $wgOut->addWikiMsg('trackbackdeleteok');
 987         }
 988
 989         function render() {
 990                 global $wgOut;
 991
 992                 $wgOut->setArticleBodyOnly(true);
 993                 $this->view();
 994         }
 995
 996         /**
 997          * Handle action=purge
 998          */
 999         function purge() {
1000                 global $wgUser, $wgRequest, $wgOut;
1001
1002                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1003                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1004                                 $this->doPurge();
1005                         }
1006                 } else {
1007                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1008                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1009                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1010                         $msg = str_replace( '$1',
1011                                 "<form method=\"post\" action=\"$action\">\n" .
1012                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1013                                 "</form>\n", $msg );
1014
1015                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1016                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1017                         $wgOut->addHTML( $msg );
1018                 }
1019         }
1020
1021         /**
1022          * Perform the actions of a page purging
1023          */
1024         function doPurge() {
1025                 global $wgUseSquid;
1026                 // Invalidate the cache
1027                 $this->mTitle->invalidateCache();
1028
1029                 if ( $wgUseSquid ) {
1030                         // Commit the transaction before the purge is sent
1031                         $dbw = wfGetDB( DB_MASTER );
1032                         $dbw->immediateCommit();
1033
1034                         // Send purge
1035                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1036                         $update->doUpdate();
1037                 }
1038                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1039                         global $wgMessageCache;
1040                         if ( $this->getID() == 0 ) {
1041                                 $text = false;
1042                         } else {
1043                                 $text = $this->getContent();
1044                         }
1045                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1046                 }
1047                 $this->view();
1048         }
1049
1050         /**
1051          * Insert a new empty page record for this article.
1052          * This *must* be followed up by creating a revision
1053          * and running $this->updateToLatest( $rev_id );
1054          * or else the record will be left in a funky state.
1055          * Best if all done inside a transaction.
1056          *
1057          * @param Database $dbw
1058          * @return int     The newly created page_id key
1059          * @private
1060          */
1061         function insertOn( $dbw ) {
1062                 wfProfileIn( __METHOD__ );
1063
1064                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1065                 $dbw->insert( 'page', array(
1066                         'page_id'           => $page_id,
1067                         'page_namespace'    => $this->mTitle->getNamespace(),
1068                         'page_title'        => $this->mTitle->getDBkey(),
1069                         'page_counter'      => 0,
1070                         'page_restrictions' => '',
1071                         'page_is_redirect'  => 0, # Will set this shortly...
1072                         'page_is_new'       => 1,
1073                         'page_random'       => wfRandom(),
1074                         'page_touched'      => $dbw->timestamp(),
1075                         'page_latest'       => 0, # Fill this in shortly...
1076                         'page_len'          => 0, # Fill this in shortly...
1077                 ), __METHOD__ );
1078                 $newid = $dbw->insertId();
1079
1080                 $this->mTitle->resetArticleId( $newid );
1081
1082                 wfProfileOut( __METHOD__ );
1083                 return $newid;
1084         }
1085
1086         /**
1087          * Update the page record to point to a newly saved revision.
1088          *
1089          * @param Database $dbw
1090          * @param Revision $revision For ID number, and text used to set
1091                                      length and redirect status fields
1092          * @param int $lastRevision If given, will not overwrite the page field
1093          *                          when different from the currently set value.
1094          *                          Giving 0 indicates the new page flag should
1095          *                          be set on.
1096          * @param bool $lastRevIsRedirect If given, will optimize adding and
1097          *                                                      removing rows in redirect table.
1098          * @return bool true on success, false on failure
1099          * @private
1100          */
1101         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1102                 wfProfileIn( __METHOD__ );
1103
1104                 $text = $revision->getText();
1105                 $rt = Title::newFromRedirect( $text );
1106
1107                 $conditions = array( 'page_id' => $this->getId() );
1108                 if( !is_null( $lastRevision ) ) {
1109                         # An extra check against threads stepping on each other
1110                         $conditions['page_latest'] = $lastRevision;
1111                 }
1112
1113                 $dbw->update( 'page',
1114                         array( /* SET */
1115                                 'page_latest'      => $revision->getId(),
1116                                 'page_touched'     => $dbw->timestamp(),
1117                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1118                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1119                                 'page_len'         => strlen( $text ),
1120                         ),
1121                         $conditions,
1122                         __METHOD__ );
1123
1124                 $result = $dbw->affectedRows() != 0;
1125
1126                 if ($result) {
1127                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1128                 }
1129
1130                 wfProfileOut( __METHOD__ );
1131                 return $result;
1132         }
1133
1134         /**
1135          * Add row to the redirect table if this is a redirect, remove otherwise.
1136          *
1137          * @param Database $dbw
1138          * @param $redirectTitle a title object pointing to the redirect target,
1139          *                                                      or NULL if this is not a redirect
1140          * @param bool $lastRevIsRedirect If given, will optimize adding and
1141          *                                                      removing rows in redirect table.
1142          * @return bool true on success, false on failure
1143          * @private
1144          */
1145         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1146
1147                 // Always update redirects (target link might have changed)
1148                 // Update/Insert if we don't know if the last revision was a redirect or not
1149                 // Delete if changing from redirect to non-redirect
1150                 $isRedirect = !is_null($redirectTitle);
1151                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1152
1153                         wfProfileIn( __METHOD__ );
1154
1155                         if ($isRedirect) {
1156
1157                                 // This title is a redirect, Add/Update row in the redirect table
1158                                 $set = array( /* SET */
1159                                         'rd_namespace' => $redirectTitle->getNamespace(),
1160                                         'rd_title'     => $redirectTitle->getDBkey(),
1161                                         'rd_from'      => $this->getId(),
1162                                 );
1163
1164                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1165                         } else {
1166                                 // This is not a redirect, remove row from redirect table
1167                                 $where = array( 'rd_from' => $this->getId() );
1168                                 $dbw->delete( 'redirect', $where, __METHOD__);
1169                         }
1170
1171                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1172                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1173                         wfProfileOut( __METHOD__ );
1174                         return ( $dbw->affectedRows() != 0 );
1175                 }
1176
1177                 return true;
1178         }
1179
1180         /**
1181          * If the given revision is newer than the currently set page_latest,
1182          * update the page record. Otherwise, do nothing.
1183          *
1184          * @param Database $dbw
1185          * @param Revision $revision
1186          */
1187         function updateIfNewerOn( &$dbw, $revision ) {
1188                 wfProfileIn( __METHOD__ );
1189
1190                 $row = $dbw->selectRow(
1191                         array( 'revision', 'page' ),
1192                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1193                         array(
1194                                 'page_id' => $this->getId(),
1195                                 'page_latest=rev_id' ),
1196                         __METHOD__ );
1197                 if( $row ) {
1198                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1199                                 wfProfileOut( __METHOD__ );
1200                                 return false;
1201                         }
1202                         $prev = $row->rev_id;
1203                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1204                 } else {
1205                         # No or missing previous revision; mark the page as new
1206                         $prev = 0;
1207                         $lastRevIsRedirect = null;
1208                 }
1209
1210                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1211                 wfProfileOut( __METHOD__ );
1212                 return $ret;
1213         }
1214
1215         /**
1216          * @return string Complete article text, or null if error
1217          */
1218         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1219                 wfProfileIn( __METHOD__ );
1220
1221                 if( $section == '' ) {
1222                         // Whole-page edit; let the text through unmolested.
1223                 } else {
1224                         if( is_null( $edittime ) ) {
1225                                 $rev = Revision::newFromTitle( $this->mTitle );
1226                         } else {
1227                                 $dbw = wfGetDB( DB_MASTER );
1228                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1229                         }
1230                         if( is_null( $rev ) ) {
1231                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1232                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1233                                 return null;
1234                         }
1235                         $oldtext = $rev->getText();
1236
1237                         if( $section == 'new' ) {
1238                                 # Inserting a new section
1239                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1240                                 $text = strlen( trim( $oldtext ) ) > 0
1241                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1242                                                 : "{$subject}{$text}";
1243                         } else {
1244                                 # Replacing an existing section; roll out the big guns
1245                                 global $wgParser;
1246                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1247                         }
1248
1249                 }
1250
1251                 wfProfileOut( __METHOD__ );
1252                 return $text;
1253         }
1254
1255         /**
1256          * @deprecated use Article::doEdit()
1257          */
1258         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1259                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1260                         ( $isminor ? EDIT_MINOR : 0 ) |
1261                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1262                         ( $bot ? EDIT_FORCE_BOT : 0 );
1263
1264                 # If this is a comment, add the summary as headline
1265                 if ( $comment && $summary != "" ) {
1266                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1267                 }
1268
1269                 $this->doEdit( $text, $summary, $flags );
1270
1271                 $dbw = wfGetDB( DB_MASTER );
1272                 if ($watchthis) {
1273                         if (!$this->mTitle->userIsWatching()) {
1274                                 $dbw->begin();
1275                                 $this->doWatch();
1276                                 $dbw->commit();
1277                         }
1278                 } else {
1279                         if ( $this->mTitle->userIsWatching() ) {
1280                                 $dbw->begin();
1281                                 $this->doUnwatch();
1282                                 $dbw->commit();
1283                         }
1284                 }
1285                 $this->doRedirect( $this->isRedirect( $text ) );
1286         }
1287
1288         /**
1289          * @deprecated use Article::doEdit()
1290          */
1291         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1292                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1293                         ( $minor ? EDIT_MINOR : 0 ) |
1294                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1295
1296                 $good = $this->doEdit( $text, $summary, $flags );
1297                 if ( $good ) {
1298                         $dbw = wfGetDB( DB_MASTER );
1299                         if ($watchthis) {
1300                                 if (!$this->mTitle->userIsWatching()) {
1301                                         $dbw->begin();
1302                                         $this->doWatch();
1303                                         $dbw->commit();
1304                                 }
1305                         } else {
1306                                 if ( $this->mTitle->userIsWatching() ) {
1307                                         $dbw->begin();
1308                                         $this->doUnwatch();
1309                                         $dbw->commit();
1310                                 }
1311                         }
1312
1313                         $extraq = ''; // Give extensions a chance to modify URL query on update
1314                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraq ) );
1315
1316                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraq );
1317                 }
1318                 return $good;
1319         }
1320
1321         /**
1322          * Article::doEdit()
1323          *
1324          * Change an existing article or create a new article. Updates RC and all necessary caches,
1325          * optionally via the deferred update array.
1326          *
1327          * $wgUser must be set before calling this function.
1328          *
1329          * @param string $text New text
1330          * @param string $summary Edit summary
1331          * @param integer $flags bitfield:
1332          *      EDIT_NEW
1333          *          Article is known or assumed to be non-existent, create a new one
1334          *      EDIT_UPDATE
1335          *          Article is known or assumed to be pre-existing, update it
1336          *      EDIT_MINOR
1337          *          Mark this edit minor, if the user is allowed to do so
1338          *      EDIT_SUPPRESS_RC
1339          *          Do not log the change in recentchanges
1340          *      EDIT_FORCE_BOT
1341          *          Mark the edit a "bot" edit regardless of user rights
1342          *      EDIT_DEFER_UPDATES
1343          *          Defer some of the updates until the end of index.php
1344          *      EDIT_AUTOSUMMARY
1345          *          Fill in blank summaries with generated text where possible
1346          *
1347          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1348          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1349          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1350          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1351          * to MediaWiki's performance-optimised locking strategy.
1352          *
1353          * @return bool success
1354          */
1355         function doEdit( $text, $summary, $flags = 0 ) {
1356                 global $wgUser, $wgDBtransactions;
1357
1358                 wfProfileIn( __METHOD__ );
1359                 $good = true;
1360
1361                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1362                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1363                         if ( $aid ) {
1364                                 $flags |= EDIT_UPDATE;
1365                         } else {
1366                                 $flags |= EDIT_NEW;
1367                         }
1368                 }
1369
1370                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1371                         &$summary, $flags & EDIT_MINOR,
1372                         null, null, &$flags ) ) )
1373                 {
1374                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1375                         wfProfileOut( __METHOD__ );
1376                         return false;
1377                 }
1378
1379                 # Silently ignore EDIT_MINOR if not allowed
1380                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1381                 $bot = $flags & EDIT_FORCE_BOT;
1382
1383                 $oldtext = $this->getContent();
1384                 $oldsize = strlen( $oldtext );
1385
1386                 # Provide autosummaries if one is not provided.
1387                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1388                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1389
1390                 $editInfo = $this->prepareTextForEdit( $text );
1391                 $text = $editInfo->pst;
1392                 $newsize = strlen( $text );
1393
1394                 $dbw = wfGetDB( DB_MASTER );
1395                 $now = wfTimestampNow();
1396
1397                 if ( $flags & EDIT_UPDATE ) {
1398                         # Update article, but only if changed.
1399
1400                         # Make sure the revision is either completely inserted or not inserted at all
1401                         if( !$wgDBtransactions ) {
1402                                 $userAbort = ignore_user_abort( true );
1403                         }
1404
1405                         $lastRevision = 0;
1406                         $revisionId = 0;
1407
1408                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1409
1410                         if ( $changed ) {
1411                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1412                                   - (int)$this->isCountable( $oldtext );
1413                                 $this->mTotalAdjustment = 0;
1414
1415                                 $lastRevision = $dbw->selectField(
1416                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1417
1418                                 if ( !$lastRevision ) {
1419                                         # Article gone missing
1420                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1421                                         wfProfileOut( __METHOD__ );
1422                                         return false;
1423                                 }
1424
1425                                 $revision = new Revision( array(
1426                                         'page'       => $this->getId(),
1427                                         'comment'    => $summary,
1428                                         'minor_edit' => $isminor,
1429                                         'text'       => $text,
1430                                         'parent_id'  => $lastRevision
1431                                         ) );
1432
1433                                 $dbw->begin();
1434                                 $revisionId = $revision->insertOn( $dbw );
1435
1436                                 # Update page
1437                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1438
1439                                 if( !$ok ) {
1440                                         /* Belated edit conflict! Run away!! */
1441                                         $good = false;
1442                                         $dbw->rollback();
1443                                 } else {
1444                                         # Update recentchanges
1445                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1446                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1447                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1448                                                         $revisionId );
1449
1450                                                 # Mark as patrolled if the user can do so
1451                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1452                                                         RecentChange::markPatrolled( $rcid );
1453                                                         PatrolLog::record( $rcid, true );
1454                                                 }
1455                                         }
1456                                         $wgUser->incEditCount();
1457                                         $dbw->commit();
1458                                 }
1459                         } else {
1460                                 $revision = null;
1461                                 // Keep the same revision ID, but do some updates on it
1462                                 $revisionId = $this->getRevIdFetched();
1463                                 // Update page_touched, this is usually implicit in the page update
1464                                 // Other cache updates are done in onArticleEdit()
1465                                 $this->mTitle->invalidateCache();
1466                         }
1467
1468                         if( !$wgDBtransactions ) {
1469                                 ignore_user_abort( $userAbort );
1470                         }
1471
1472                         if ( $good ) {
1473                                 # Invalidate cache of this article and all pages using this article
1474                                 # as a template. Partly deferred.
1475                                 Article::onArticleEdit( $this->mTitle );
1476
1477                                 # Update links tables, site stats, etc.
1478                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1479                         }
1480                 } else {
1481                         # Create new article
1482
1483                         # Set statistics members
1484                         # We work out if it's countable after PST to avoid counter drift
1485                         # when articles are created with {{subst:}}
1486                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1487                         $this->mTotalAdjustment = 1;
1488
1489                         $dbw->begin();
1490
1491                         # Add the page record; stake our claim on this title!
1492                         # This will fail with a database query exception if the article already exists
1493                         $newid = $this->insertOn( $dbw );
1494
1495                         # Save the revision text...
1496                         $revision = new Revision( array(
1497                                 'page'       => $newid,
1498                                 'comment'    => $summary,
1499                                 'minor_edit' => $isminor,
1500                                 'text'       => $text
1501                                 ) );
1502                         $revisionId = $revision->insertOn( $dbw );
1503
1504                         $this->mTitle->resetArticleID( $newid );
1505
1506                         # Update the page record with revision data
1507                         $this->updateRevisionOn( $dbw, $revision, 0 );
1508
1509                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1510                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1511                                   '', strlen( $text ), $revisionId );
1512                                 # Mark as patrolled if the user can
1513                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $wgUser->isAllowed( 'autopatrol' ) ) {
1514                                         RecentChange::markPatrolled( $rcid );
1515                                         PatrolLog::record( $rcid, true );
1516                                 }
1517                         }
1518                         $wgUser->incEditCount();
1519                         $dbw->commit();
1520
1521                         # Update links, etc.
1522                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1523
1524                         # Clear caches
1525                         Article::onArticleCreate( $this->mTitle );
1526
1527                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text, $summary,
1528                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1529                 }
1530
1531                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1532                         wfDoUpdates();
1533                 }
1534
1535                 if ( $good ) {
1536                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary,
1537                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1538                 }
1539
1540                 wfProfileOut( __METHOD__ );
1541                 return $good;
1542         }
1543
1544         /**
1545          * @deprecated wrapper for doRedirect
1546          */
1547         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1548                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1549         }
1550
1551         /**
1552          * Output a redirect back to the article.
1553          * This is typically used after an edit.
1554          *
1555          * @param boolean $noRedir Add redirect=no
1556          * @param string $sectionAnchor section to redirect to, including "#"
1557          * @param string $extraq, extra query params
1558          */
1559         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraq = '' ) {
1560                 global $wgOut;
1561                 if ( $noRedir ) {
1562                         $query = 'redirect=no';
1563                         if( $extraq )
1564                                 $query .= "&$query";
1565                 } else {
1566                         $query = $extraq;
1567                 }
1568                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1569         }
1570
1571         /**
1572          * Mark this particular edit/page as patrolled
1573          */
1574         function markpatrolled() {
1575                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1576                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1577
1578                 # Check patrol config options
1579
1580                 if ( !($wgUseNPPatrol || $wgUseRCPatrol)) {
1581                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1582                         return;
1583                 }
1584
1585                 # If we haven't been given an rc_id value, we can't do anything
1586                 $rcid = (int) $wgRequest->getVal('rcid');
1587                 $rc = $rcid ? RecentChange::newFromId($rcid) : null;
1588                 if ( is_null ( $rc ) )
1589                 {
1590                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1591                         return;
1592                 }
1593
1594                 if ( !$wgUseRCPatrol && $rc->getAttribute( 'rc_type' ) != RC_NEW) {
1595                         // Only new pages can be patrolled if the general patrolling is off....???
1596                         // @fixme -- is this necessary? Shouldn't we only bother controlling the
1597                         // front end here?
1598                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1599                         return;
1600                 }
1601
1602                 # Check permissions
1603                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'patrol', $wgUser );
1604
1605                 if (count($permission_errors)>0)
1606                 {
1607                         $wgOut->showPermissionsErrorPage( $permission_errors );
1608                         return;
1609                 }
1610
1611                 # Handle the 'MarkPatrolled' hook
1612                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1613                         return;
1614                 }
1615
1616                 #It would be nice to see where the user had actually come from, but for now just guess
1617                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1618                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1619
1620                 # If it's left up to us, check that the user is allowed to patrol this edit
1621                 # If the user has the "autopatrol" right, then we'll assume there are no
1622                 # other conditions stopping them doing so
1623                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1624                         $rc = RecentChange::newFromId( $rcid );
1625                         # Graceful error handling, as we've done before here...
1626                         # (If the recent change doesn't exist, then it doesn't matter whether
1627                         # the user is allowed to patrol it or not; nothing is going to happen
1628                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1629                                 # The user made this edit, and can't patrol it
1630                                 # Tell them so, and then back off
1631                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1632                                 $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1633                                 $wgOut->returnToMain( false, $return );
1634                                 return;
1635                         }
1636                 }
1637
1638                 # Check that the revision isn't patrolled already
1639                 # Prevents duplicate log entries
1640                 if( !$rc->getAttribute( 'rc_patrolled' ) ) {
1641                         # Mark the edit as patrolled
1642                         RecentChange::markPatrolled( $rcid );
1643                         PatrolLog::record( $rcid );
1644                         wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1645                 }
1646
1647                 # Inform the user
1648                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1649                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1650                 $wgOut->returnToMain( false, $return );
1651         }
1652
1653         /**
1654          * User-interface handler for the "watch" action
1655          */
1656
1657         function watch() {
1658
1659                 global $wgUser, $wgOut;
1660
1661                 if ( $wgUser->isAnon() ) {
1662                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1663                         return;
1664                 }
1665                 if ( wfReadOnly() ) {
1666                         $wgOut->readOnlyPage();
1667                         return;
1668                 }
1669
1670                 if( $this->doWatch() ) {
1671                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1672                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1673
1674                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1675                 }
1676
1677                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1678         }
1679
1680         /**
1681          * Add this page to $wgUser's watchlist
1682          * @return bool true on successful watch operation
1683          */
1684         function doWatch() {
1685                 global $wgUser;
1686                 if( $wgUser->isAnon() ) {
1687                         return false;
1688                 }
1689
1690                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1691                         $wgUser->addWatch( $this->mTitle );
1692
1693                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1694                 }
1695
1696                 return false;
1697         }
1698
1699         /**
1700          * User interface handler for the "unwatch" action.
1701          */
1702         function unwatch() {
1703
1704                 global $wgUser, $wgOut;
1705
1706                 if ( $wgUser->isAnon() ) {
1707                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1708                         return;
1709                 }
1710                 if ( wfReadOnly() ) {
1711                         $wgOut->readOnlyPage();
1712                         return;
1713                 }
1714
1715                 if( $this->doUnwatch() ) {
1716                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1717                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1718
1719                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1720                 }
1721
1722                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1723         }
1724
1725         /**
1726          * Stop watching a page
1727          * @return bool true on successful unwatch
1728          */
1729         function doUnwatch() {
1730                 global $wgUser;
1731                 if( $wgUser->isAnon() ) {
1732                         return false;
1733                 }
1734
1735                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1736                         $wgUser->removeWatch( $this->mTitle );
1737
1738                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1739                 }
1740
1741                 return false;
1742         }
1743
1744         /**
1745          * action=protect handler
1746          */
1747         function protect() {
1748                 $form = new ProtectionForm( $this );
1749                 $form->execute();
1750         }
1751
1752         /**
1753          * action=unprotect handler (alias)
1754          */
1755         function unprotect() {
1756                 $this->protect();
1757         }
1758
1759         /**
1760          * Update the article's restriction field, and leave a log entry.
1761          *
1762          * @param array $limit set of restriction keys
1763          * @param string $reason
1764          * @return bool true on success
1765          */
1766         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1767                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1768
1769                 $id = $this->mTitle->getArticleID();
1770                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1771                         return false;
1772                 }
1773
1774                 if (!$cascade) {
1775                         $cascade = false;
1776                 }
1777
1778                 // Take this opportunity to purge out expired restrictions
1779                 Title::purgeExpiredRestrictions();
1780
1781                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1782                 # we expect a single selection, but the schema allows otherwise.
1783                 $current = array();
1784                 foreach( $wgRestrictionTypes as $action )
1785                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1786
1787                 $current = Article::flattenRestrictions( $current );
1788                 $updated = Article::flattenRestrictions( $limit );
1789
1790                 $changed = ( $current != $updated );
1791                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1792                 $changed = $changed || ($updated && $this->mTitle->mRestrictionsExpiry != $expiry);
1793                 $protect = ( $updated != '' );
1794
1795                 # If nothing's changed, do nothing
1796                 if( $changed ) {
1797                         global $wgGroupPermissions;
1798                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1799
1800                                 $dbw = wfGetDB( DB_MASTER );
1801
1802                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1803
1804                                 $expiry_description = '';
1805                                 if ( $encodedExpiry != 'infinity' ) {
1806                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry, false, false ) ).')';
1807                                 }
1808
1809                                 # Prepare a null revision to be added to the history
1810                                 $modified = $current != '' && $protect;
1811                                 if ( $protect ) {
1812                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1813                                 } else {
1814                                         $comment_type = 'unprotectedarticle';
1815                                 }
1816                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1817
1818                                 foreach( $limit as $action => $restrictions ) {
1819                                         # Check if the group level required to edit also can protect pages
1820                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1821                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) &&
1822                                                 $wgGroupPermissions[$restrictions]['protect'] );
1823                                 }
1824
1825                                 $cascade_description = '';
1826                                 if ($cascade) {
1827                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1828                                 }
1829
1830                                 if( $reason )
1831                                         $comment .= ": $reason";
1832                                 if( $protect )
1833                                         $comment .= " [$updated]";
1834                                 if ( $expiry_description && $protect )
1835                                         $comment .= "$expiry_description";
1836                                 if ( $cascade )
1837                                         $comment .= "$cascade_description";
1838
1839                                 # Update restrictions table
1840                                 foreach( $limit as $action => $restrictions ) {
1841                                         if ($restrictions != '' ) {
1842                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1843                                                         array( 'pr_page' => $id, 'pr_type' => $action
1844                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1845                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1846                                         } else {
1847                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1848                                                         'pr_type' => $action ), __METHOD__ );
1849                                         }
1850                                 }
1851
1852                                 # Insert a null revision
1853                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1854                                 $nullRevId = $nullRevision->insertOn( $dbw );
1855
1856                                 # Update page record
1857                                 $dbw->update( 'page',
1858                                         array( /* SET */
1859                                                 'page_touched' => $dbw->timestamp(),
1860                                                 'page_restrictions' => '',
1861                                                 'page_latest' => $nullRevId
1862                                         ), array( /* WHERE */
1863                                                 'page_id' => $id
1864                                         ), 'Article::protect'
1865                                 );
1866                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1867
1868                                 # Update the protection log
1869                                 $log = new LogPage( 'protect' );
1870
1871
1872
1873                                 if( $protect ) {
1874                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1875                                 } else {
1876                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1877                                 }
1878
1879                         } # End hook
1880                 } # End "changed" check
1881
1882                 return true;
1883         }
1884
1885         /**
1886          * Take an array of page restrictions and flatten it to a string
1887          * suitable for insertion into the page_restrictions field.
1888          * @param array $limit
1889          * @return string
1890          * @private
1891          */
1892         function flattenRestrictions( $limit ) {
1893                 if( !is_array( $limit ) ) {
1894                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1895                 }
1896                 $bits = array();
1897                 ksort( $limit );
1898                 foreach( $limit as $action => $restrictions ) {
1899                         if( $restrictions != '' ) {
1900                                 $bits[] = "$action=$restrictions";
1901                         }
1902                 }
1903                 return implode( ':', $bits );
1904         }
1905
1906         /**
1907          * Auto-generates a deletion reason
1908          * @param bool &$hasHistory Whether the page has a history
1909          */
1910         public function generateReason(&$hasHistory)
1911         {
1912                 global $wgContLang;
1913                 $dbw = wfGetDB(DB_MASTER);
1914                 // Get the last revision
1915                 $rev = Revision::newFromTitle($this->mTitle);
1916                 if(is_null($rev))
1917                         return false;
1918                 // Get the article's contents
1919                 $contents = $rev->getText();
1920                 $blank = false;
1921                 // If the page is blank, use the text from the previous revision,
1922                 // which can only be blank if there's a move/import/protect dummy revision involved
1923                 if($contents == '')
1924                 {
1925                         $prev = $rev->getPrevious();
1926                         if($prev)
1927                         {
1928                                 $contents = $prev->getText();
1929                                 $blank = true;
1930                         }
1931                 }
1932
1933                 // Find out if there was only one contributor
1934                 // Only scan the last 20 revisions
1935                 $limit = 20;
1936                 $res = $dbw->select('revision', 'rev_user_text', array('rev_page' => $this->getID()), __METHOD__,
1937                                 array('LIMIT' => $limit));
1938                 if($res === false)
1939                         // This page has no revisions, which is very weird
1940                         return false;
1941                 if($res->numRows() > 1)
1942                                 $hasHistory = true;
1943                 else
1944                                 $hasHistory = false;
1945                 $row = $dbw->fetchObject($res);
1946                 $onlyAuthor = $row->rev_user_text;
1947                 // Try to find a second contributor
1948                 while( $row = $dbw->fetchObject($res) ) {
1949                         if($row->rev_user_text != $onlyAuthor) {
1950                                 $onlyAuthor = false;
1951                                 break;
1952                         }
1953                 }
1954                 $dbw->freeResult($res);
1955
1956                 // Generate the summary with a '$1' placeholder
1957                 if($blank) {
1958                         // The current revision is blank and the one before is also
1959                         // blank. It's just not our lucky day
1960                         $reason = wfMsgForContent('exbeforeblank', '$1');
1961                 } else {
1962                         if($onlyAuthor)
1963                                 $reason = wfMsgForContent('excontentauthor', '$1', $onlyAuthor);
1964                         else
1965                                 $reason = wfMsgForContent('excontent', '$1');
1966                 }
1967
1968                 // Replace newlines with spaces to prevent uglyness
1969                 $contents = preg_replace("/[\n\r]/", ' ', $contents);
1970                 // Calculate the maximum amount of chars to get
1971                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
1972                 $maxLength = 255 - (strlen($reason) - 2) - 3;
1973                 $contents = $wgContLang->truncate($contents, $maxLength, '...');
1974                 // Remove possible unfinished links
1975                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
1976                 // Now replace the '$1' placeholder
1977                 $reason = str_replace( '$1', $contents, $reason );
1978                 return $reason;
1979         }
1980
1981
1982         /*
1983          * UI entry point for page deletion
1984          */
1985         function delete() {
1986                 global $wgUser, $wgOut, $wgRequest;
1987
1988                 $confirm = $wgRequest->wasPosted() &&
1989                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1990
1991                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1992                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1993
1994                 $reason = $this->DeleteReasonList;
1995
1996                 if ( $reason != 'other' && $this->DeleteReason != '') {
1997                         // Entry from drop down menu + additional comment
1998                         $reason .= ': ' . $this->DeleteReason;
1999                 } elseif ( $reason == 'other' ) {
2000                         $reason = $this->DeleteReason;
2001                 }
2002                 # Flag to hide all contents of the archived revisions
2003                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('deleterevision');
2004
2005                 # This code desperately needs to be totally rewritten
2006
2007                 # Read-only check...
2008                 if ( wfReadOnly() ) {
2009                         $wgOut->readOnlyPage();
2010                         return;
2011                 }
2012
2013                 # Check permissions
2014                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2015
2016                 if (count($permission_errors)>0) {
2017                         $wgOut->showPermissionsErrorPage( $permission_errors );
2018                         return;
2019                 }
2020
2021                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2022
2023                 # Better double-check that it hasn't been deleted yet!
2024                 $dbw = wfGetDB( DB_MASTER );
2025                 $conds = $this->mTitle->pageCond();
2026                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2027                 if ( $latest === false ) {
2028                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2029                         return;
2030                 }
2031
2032                 # Hack for big sites
2033                 $bigHistory = $this->isBigDeletion();
2034                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2035                         global $wgLang, $wgDeleteRevisionsLimit;
2036                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2037                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2038                         return;
2039                 }
2040
2041                 if( $confirm ) {
2042                         $this->doDelete( $reason, $suppress );
2043                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2044                                 $this->doWatch();
2045                         } elseif( $this->mTitle->userIsWatching() ) {
2046                                 $this->doUnwatch();
2047                         }
2048                         return;
2049                 }
2050
2051                 // Generate deletion reason
2052                 $hasHistory = false;
2053                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2054
2055                 // If the page has a history, insert a warning
2056                 if( $hasHistory && !$confirm ) {
2057                         $skin=$wgUser->getSkin();
2058                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2059                         if( $bigHistory ) {
2060                                 global $wgLang, $wgDeleteRevisionsLimit;
2061                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2062                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2063                         }
2064                 }
2065
2066                 return $this->confirmDelete( '', $reason );
2067         }
2068
2069         /**
2070          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2071          */
2072         function isBigDeletion() {
2073                 global $wgDeleteRevisionsLimit;
2074                 if( $wgDeleteRevisionsLimit ) {
2075                         $revCount = $this->estimateRevisionCount();
2076                         return $revCount > $wgDeleteRevisionsLimit;
2077                 }
2078                 return false;
2079         }
2080
2081         /**
2082          * @return int approximate revision count
2083          */
2084         function estimateRevisionCount() {
2085                 $dbr = wfGetDB();
2086                 // For an exact count...
2087                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2088                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2089                 return $dbr->estimateRowCount( 'revision', '*',
2090                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2091         }
2092
2093         /**
2094          * Get the last N authors
2095          * @param int $num Number of revisions to get
2096          * @param string $revLatest The latest rev_id, selected from the master (optional)
2097          * @return array Array of authors, duplicates not removed
2098          */
2099         function getLastNAuthors( $num, $revLatest = 0 ) {
2100                 wfProfileIn( __METHOD__ );
2101
2102                 // First try the slave
2103                 // If that doesn't have the latest revision, try the master
2104                 $continue = 2;
2105                 $db = wfGetDB( DB_SLAVE );
2106                 do {
2107                         $res = $db->select( array( 'page', 'revision' ),
2108                                 array( 'rev_id', 'rev_user_text' ),
2109                                 array(
2110                                         'page_namespace' => $this->mTitle->getNamespace(),
2111                                         'page_title' => $this->mTitle->getDBkey(),
2112                                         'rev_page = page_id'
2113                                 ), __METHOD__, $this->getSelectOptions( array(
2114                                         'ORDER BY' => 'rev_timestamp DESC',
2115                                         'LIMIT' => $num
2116                                 ) )
2117                         );
2118                         if ( !$res ) {
2119                                 wfProfileOut( __METHOD__ );
2120                                 return array();
2121                         }
2122                         $row = $db->fetchObject( $res );
2123                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2124                                 $db = wfGetDB( DB_MASTER );
2125                                 $continue--;
2126                         } else {
2127                                 $continue = 0;
2128                         }
2129                 } while ( $continue );
2130
2131                 $authors = array( $row->rev_user_text );
2132                 while ( $row = $db->fetchObject( $res ) ) {
2133                         $authors[] = $row->rev_user_text;
2134                 }
2135                 wfProfileOut( __METHOD__ );
2136                 return $authors;
2137         }
2138
2139         /**
2140          * Output deletion confirmation dialog
2141          * @param $par string FIXME: do we need this parameter? One Call from Article::delete with '' only.
2142          * @param $reason string Prefilled reason
2143          */
2144         function confirmDelete( $par, $reason ) {
2145                 global $wgOut, $wgUser, $wgContLang;
2146                 $align = $wgContLang->isRtl() ? 'left' : 'right';
2147
2148                 wfDebug( "Article::confirmDelete\n" );
2149
2150                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2151                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2152                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2153
2154                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2155                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\"><td></td><td>";
2156                         $suppress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2157                         $suppress .= "</td></tr>";
2158                 } else {
2159                         $suppress = '';
2160                 }
2161
2162                 $form = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->mTitle->getLocalURL( 'action=delete' . $par ), 'id' => 'deleteconfirm' ) ) .
2163                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2164                         Xml::element( 'legend', null, wfMsg( 'delete-legend' ) ) .
2165                         Xml::openElement( 'table' ) .
2166                         "<tr id=\"wpDeleteReasonListRow\">
2167                                 <td align='$align'>" .
2168                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2169                                 "</td>
2170                                 <td>" .
2171                                         Xml::listDropDown( 'wpDeleteReasonList',
2172                                                 wfMsgForContent( 'deletereason-dropdown' ),
2173                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2174                                 "</td>
2175                         </tr>
2176                         <tr id=\"wpDeleteReasonRow\">
2177                                 <td align='$align'>" .
2178                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2179                                 "</td>
2180                                 <td>" .
2181                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255', 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2182                                 "</td>
2183                         </tr>
2184                         <tr>
2185                                 <td></td>
2186                                 <td>" .
2187                                         Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '3' ) ) .
2188                                 "</td>
2189                         </tr>
2190                         $suppress
2191                         <tr>
2192                                 <td></td>
2193                                 <td>" .
2194                                         Xml::submitButton( wfMsg( 'deletepage' ), array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '4' ) ) .
2195                                 "</td>
2196                         </tr>" .
2197                         Xml::closeElement( 'table' ) .
2198                         Xml::closeElement( 'fieldset' ) .
2199                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2200                         Xml::closeElement( 'form' );
2201
2202                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2203                                 $skin = $wgUser->getSkin();
2204                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2205                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2206                         }
2207
2208                 $wgOut->addHTML( $form );
2209                 $this->showLogExtract( $wgOut );
2210         }
2211
2212
2213         /**
2214          * Show relevant lines from the deletion log
2215          */
2216         function showLogExtract( $out ) {
2217                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2218                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2219         }
2220
2221
2222         /**
2223          * Perform a deletion and output success or failure messages
2224          */
2225         function doDelete( $reason, $suppress = false ) {
2226                 global $wgOut, $wgUser;
2227                 wfDebug( __METHOD__."\n" );
2228
2229                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2230                         if ( $this->doDeleteArticle( $reason, $suppress ) ) {
2231                                 $deleted = $this->mTitle->getPrefixedText();
2232
2233                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2234                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2235
2236                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2237
2238                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2239                                 $wgOut->returnToMain( false );
2240                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2241                         } else {
2242                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ).'<br/>'.wfMsg('cannotdelete-merge') );
2243                         }
2244                 }
2245         }
2246
2247         /**
2248          * Back-end article deletion
2249          * Deletes the article with database consistency, writes logs, purges caches
2250          * Returns success
2251          */
2252         function doDeleteArticle( $reason, $suppress = false ) {
2253                 global $wgUseSquid, $wgDeferredUpdateList;
2254                 global $wgUseTrackbacks;
2255
2256                 wfDebug( __METHOD__."\n" );
2257
2258                 $dbw = wfGetDB( DB_MASTER );
2259                 $ns = $this->mTitle->getNamespace();
2260                 $t = $this->mTitle->getDBkey();
2261                 $id = $this->mTitle->getArticleID();
2262
2263                 if ( $t == '' || $id == 0 ) {
2264                         return false;
2265                 }
2266
2267                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2268                 array_push( $wgDeferredUpdateList, $u );
2269
2270                 // Bitfields to further suppress the content
2271                 if ( $suppress ) {
2272                         $bitfield = 0;
2273                         // This should be 15...
2274                         $bitfield |= Revision::DELETED_TEXT;
2275                         $bitfield |= Revision::DELETED_COMMENT;
2276                         $bitfield |= Revision::DELETED_USER;
2277                         $bitfield |= Revision::DELETED_RESTRICTED;
2278                 } else {
2279                         $bitfield = 'rev_deleted';
2280                 }
2281
2282                 // For now, shunt the revision data into the archive table.
2283                 // Text is *not* removed from the text table; bulk storage
2284                 // is left intact to avoid breaking block-compression or
2285                 // immutable storage schemes.
2286                 //
2287                 // For backwards compatibility, note that some older archive
2288                 // table entries will have ar_text and ar_flags fields still.
2289                 //
2290                 // In the future, we may keep revisions and mark them with
2291                 // the rev_deleted field, which is reserved for this purpose.
2292                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2293                         array(
2294                                 'ar_namespace'  => 'page_namespace',
2295                                 'ar_title'      => 'page_title',
2296                                 'ar_comment'    => 'rev_comment',
2297                                 'ar_user'       => 'rev_user',
2298                                 'ar_user_text'  => 'rev_user_text',
2299                                 'ar_timestamp'  => 'rev_timestamp',
2300                                 'ar_minor_edit' => 'rev_minor_edit',
2301                                 'ar_rev_id'     => 'rev_id',
2302                                 'ar_text_id'    => 'rev_text_id',
2303                                 'ar_text'       => '\'\'', // Be explicit to appease
2304                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2305                                 'ar_len'        => 'rev_len',
2306                                 'ar_page_id'    => 'page_id',
2307                                 'ar_deleted'    => $bitfield
2308                         ), array(
2309                                 'page_id' => $id,
2310                                 'page_id = rev_page'
2311                         ), __METHOD__
2312                 );
2313
2314                 # Delete restrictions for it
2315                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2316
2317                 # Fix category table counts
2318                 $cats = array();
2319                 $res = $dbw->select( 'categorylinks', 'cl_to',
2320                         array( 'cl_from' => $id ), __METHOD__ );
2321                 foreach( $res as $row ) {
2322                         $cats []= $row->cl_to;
2323                 }
2324                 $this->updateCategoryCounts( array(), $cats );
2325
2326                 # Now that it's safely backed up, delete it
2327                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2328
2329                 # If using cascading deletes, we can skip some explicit deletes
2330                 if ( !$dbw->cascadingDeletes() ) {
2331                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2332
2333                         if ($wgUseTrackbacks)
2334                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2335
2336                         # Delete outgoing links
2337                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2338                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2339                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2340                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2341                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2342                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2343                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2344                 }
2345
2346                 # If using cleanup triggers, we can skip some manual deletes
2347                 if ( !$dbw->cleanupTriggers() ) {
2348
2349                         # Clean up recentchanges entries...
2350                         $dbw->delete( 'recentchanges',
2351                                 array( 'rc_namespace' => $ns, 'rc_title' => $t, 'rc_type != '.RC_LOG ),
2352                                 __METHOD__ );
2353                 }
2354
2355                 # Clear caches
2356                 Article::onArticleDelete( $this->mTitle );
2357
2358                 # Clear the cached article id so the interface doesn't act like we exist
2359                 $this->mTitle->resetArticleID( 0 );
2360                 $this->mTitle->mArticleID = 0;
2361
2362                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2363                 $logtype = $suppress ? 'suppress' : 'delete';
2364                 $log = new LogPage( $logtype );
2365                 $log->addEntry( 'delete', $this->mTitle, $reason );
2366
2367                 return true;
2368         }
2369
2370         /**
2371          * Roll back the most recent consecutive set of edits to a page
2372          * from the same user; fails if there are no eligible edits to
2373          * roll back to, e.g. user is the sole contributor. This function
2374          * performs permissions checks on $wgUser, then calls commitRollback()
2375          * to do the dirty work
2376          *
2377          * @param string $fromP - Name of the user whose edits to rollback.
2378          * @param string $summary - Custom summary. Set to default summary if empty.
2379          * @param string $token - Rollback token.
2380          * @param bool   $bot - If true, mark all reverted edits as bot.
2381          *
2382          * @param array $resultDetails contains result-specific array of additional values
2383          *    'alreadyrolled' : 'current' (rev)
2384          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2385          *
2386          * @return array of errors, each error formatted as
2387          *   array(messagekey, param1, param2, ...).
2388          * On success, the array is empty.  This array can also be passed to
2389          * OutputPage::showPermissionsErrorPage().
2390          */
2391         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2392                 global $wgUser;
2393                 $resultDetails = null;
2394
2395                 # Check permissions
2396                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2397                                                 $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2398                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2399                         $errors[] = array( 'sessionfailure' );
2400
2401                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2402                         $errors[] = array( 'actionthrottledtext' );
2403                 }
2404                 # If there were errors, bail out now
2405                 if(!empty($errors))
2406                         return $errors;
2407
2408                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2409         }
2410
2411         /**
2412          * Backend implementation of doRollback(), please refer there for parameter
2413          * and return value documentation
2414          *
2415          * NOTE: This function does NOT check ANY permissions, it just commits the
2416          * rollback to the DB Therefore, you should only call this function direct-
2417          * ly if you want to use custom permissions checks. If you don't, use
2418          * doRollback() instead.
2419          */
2420         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2421                 global $wgUseRCPatrol, $wgUser;
2422                 $dbw = wfGetDB( DB_MASTER );
2423
2424                 if( wfReadOnly() ) {
2425                         return array( array( 'readonlytext' ) );
2426                 }
2427
2428                 # Get the last editor
2429                 $current = Revision::newFromTitle( $this->mTitle );
2430                 if( is_null( $current ) ) {
2431                         # Something wrong... no page?
2432                         return array(array('notanarticle'));
2433                 }
2434
2435                 $from = str_replace( '_', ' ', $fromP );
2436                 if( $from != $current->getUserText() ) {
2437                         $resultDetails = array( 'current' => $current );
2438                         return array(array('alreadyrolled',
2439                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2440                                 htmlspecialchars($fromP),
2441                                 htmlspecialchars($current->getUserText())
2442                         ));
2443                 }
2444
2445                 # Get the last edit not by this guy
2446                 $user = intval( $current->getUser() );
2447                 $user_text = $dbw->addQuotes( $current->getUserText() );
2448                 $s = $dbw->selectRow( 'revision',
2449                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2450                         array(  'rev_page' => $current->getPage(),
2451                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2452                         ), __METHOD__,
2453                         array(  'USE INDEX' => 'page_timestamp',
2454                                 'ORDER BY'  => 'rev_timestamp DESC' )
2455                         );
2456                 if( $s === false ) {
2457                         # No one else ever edited this page
2458                         return array(array('cantrollback'));
2459                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2460                         # Only admins can see this text
2461                         return array(array('notvisiblerev'));
2462                 }
2463
2464                 $set = array();
2465                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2466                         # Mark all reverted edits as bot
2467                         $set['rc_bot'] = 1;
2468                 }
2469                 if ( $wgUseRCPatrol ) {
2470                         # Mark all reverted edits as patrolled
2471                         $set['rc_patrolled'] = 1;
2472                 }
2473
2474                 if ( $set ) {
2475                         $dbw->update( 'recentchanges', $set,
2476                                         array( /* WHERE */
2477                                                 'rc_cur_id' => $current->getPage(),
2478                                                 'rc_user_text' => $current->getUserText(),
2479                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2480                                         ), __METHOD__
2481                                 );
2482                 }
2483
2484                 # Generate the edit summary if necessary
2485                 $target = Revision::newFromId( $s->rev_id );
2486                 if( empty( $summary ) )
2487                 {
2488                         global $wgLang;
2489                         $summary = wfMsgForContent( 'revertpage',
2490                                          $target->getUserText(), $from,
2491                                          $s->rev_id, $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2492                                          $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2493                         );
2494                 }
2495
2496                 # Save
2497                 $flags = EDIT_UPDATE;
2498
2499                 if ($wgUser->isAllowed('minoredit'))
2500                         $flags |= EDIT_MINOR;
2501
2502                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2503                         $flags |= EDIT_FORCE_BOT;
2504                 $this->doEdit( $target->getText(), $summary, $flags );
2505
2506                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2507
2508                 $resultDetails = array(
2509                         'summary' => $summary,
2510                         'current' => $current,
2511                         'target' => $target,
2512                 );
2513                 return array();
2514         }
2515
2516         /**
2517          * User interface for rollback operations
2518          */
2519         function rollback() {
2520                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2521                 $details = null;
2522
2523                 $result = $this->doRollback(
2524                         $wgRequest->getVal( 'from' ),
2525                         $wgRequest->getText( 'summary' ),
2526                         $wgRequest->getVal( 'token' ),
2527                         $wgRequest->getBool( 'bot' ),
2528                         $details
2529                 );
2530
2531                 if( in_array( array( 'blocked' ), $result ) ) {
2532                         $wgOut->blockedPage();
2533                         return;
2534                 }
2535                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2536                         $wgOut->rateLimited();
2537                         return;
2538                 }
2539                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ){
2540                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2541                         $errArray = $result[0];
2542                         $errMsg = array_shift( $errArray );
2543                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2544                         if( isset( $details['current'] ) ){
2545                                 $current = $details['current'];
2546                                 if( $current->getComment() != '' ) {
2547                                         $wgOut->addWikiMsgArray( 'editcomment', array( $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2548                                 }
2549                         }
2550                         return;
2551                 }
2552                 # Display permissions errors before read-only message -- there's no
2553                 # point in misleading the user into thinking the inability to rollback
2554                 # is only temporary.
2555                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2556                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2557                         # move any 'readonlytext' error manually.
2558                         $out = array();
2559                         foreach( $result as $error ) {
2560                                 if( $error != array( 'readonlytext' ) ) {
2561                                         $out []= $error;
2562                                 }
2563                         }
2564                         $wgOut->showPermissionsErrorPage( $out );
2565                         return;
2566                 }
2567                 if( $result == array( array('readonlytext') ) ) {
2568                         $wgOut->readOnlyPage();
2569                         return;
2570                 }
2571
2572                 $current = $details['current'];
2573                 $target = $details['target'];
2574                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2575                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2576                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2577                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2578                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2579                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2580                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2581                 $wgOut->returnToMain( false, $this->mTitle );
2582         }
2583
2584
2585         /**
2586          * Do standard deferred updates after page view
2587          * @private
2588          */
2589         function viewUpdates() {
2590                 global $wgDeferredUpdateList;
2591
2592                 if ( 0 != $this->getID() ) {
2593                         global $wgDisableCounters;
2594                         if( !$wgDisableCounters ) {
2595                                 Article::incViewCount( $this->getID() );
2596                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2597                                 array_push( $wgDeferredUpdateList, $u );
2598                         }
2599                 }
2600
2601                 # Update newtalk / watchlist notification status
2602                 global $wgUser;
2603                 $wgUser->clearNotification( $this->mTitle );
2604         }
2605
2606         /**
2607          * Prepare text which is about to be saved.
2608          * Returns a stdclass with source, pst and output members
2609          */
2610         function prepareTextForEdit( $text, $revid=null ) {
2611                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2612                         // Already prepared
2613                         return $this->mPreparedEdit;
2614                 }
2615                 global $wgParser;
2616                 $edit = (object)array();
2617                 $edit->revid = $revid;
2618                 $edit->newText = $text;
2619                 $edit->pst = $this->preSaveTransform( $text );
2620                 $options = new ParserOptions;
2621                 $options->setTidy( true );
2622                 $options->enableLimitReport();
2623                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2624                 $edit->oldText = $this->getContent();
2625                 $this->mPreparedEdit = $edit;
2626                 return $edit;
2627         }
2628
2629         /**
2630          * Do standard deferred updates after page edit.
2631          * Update links tables, site stats, search index and message cache.
2632          * Every 100th edit, prune the recent changes table.
2633          *
2634          * @private
2635          * @param $text New text of the article
2636          * @param $summary Edit summary
2637          * @param $minoredit Minor edit
2638          * @param $timestamp_of_pagechange Timestamp associated with the page change
2639          * @param $newid rev_id value of the new revision
2640          * @param $changed Whether or not the content actually changed
2641          */
2642         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2643                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2644
2645                 wfProfileIn( __METHOD__ );
2646
2647                 # Parse the text
2648                 # Be careful not to double-PST: $text is usually already PST-ed once
2649                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2650                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2651                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2652                 } else {
2653                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2654                         $editInfo = $this->mPreparedEdit;
2655                 }
2656
2657                 # Save it to the parser cache
2658                 if ( $wgEnableParserCache ) {
2659                         $parserCache = ParserCache::singleton();
2660                         $parserCache->save( $editInfo->output, $this, $wgUser );
2661                 }
2662
2663                 # Update the links tables
2664                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2665                 $u->doUpdate();
2666
2667                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2668                         if ( 0 == mt_rand( 0, 99 ) ) {
2669                                 // Flush old entries from the `recentchanges` table; we do this on
2670                                 // random requests so as to avoid an increase in writes for no good reason
2671                                 global $wgRCMaxAge;
2672                                 $dbw = wfGetDB( DB_MASTER );
2673                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2674                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2675                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2676                                 $dbw->query( $sql );
2677                         }
2678                 }
2679
2680                 $id = $this->getID();
2681                 $title = $this->mTitle->getPrefixedDBkey();
2682                 $shortTitle = $this->mTitle->getDBkey();
2683
2684                 if ( 0 == $id ) {
2685                         wfProfileOut( __METHOD__ );
2686                         return;
2687                 }
2688
2689                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2690                 array_push( $wgDeferredUpdateList, $u );
2691                 $u = new SearchUpdate( $id, $title, $text );
2692                 array_push( $wgDeferredUpdateList, $u );
2693
2694                 # If this is another user's talk page, update newtalk
2695                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2696                 # load of user talk pages and piss people off, nor if it's a minor edit
2697                 # by a properly-flagged bot.
2698                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2699                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2700                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2701                                 $other = User::newFromName( $shortTitle );
2702                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2703                                         // An anonymous user
2704                                         $other = new User();
2705                                         $other->setName( $shortTitle );
2706                                 }
2707                                 if( $other ) {
2708                                         $other->setNewtalk( true );
2709                                 }
2710                         }
2711                 }
2712
2713                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2714                         $wgMessageCache->replace( $shortTitle, $text );
2715                 }
2716
2717                 wfProfileOut( __METHOD__ );
2718         }
2719
2720         /**
2721          * Perform article updates on a special page creation.
2722          *
2723          * @param Revision $rev
2724          *
2725          * @todo This is a shitty interface function. Kill it and replace the
2726          * other shitty functions like editUpdates and such so it's not needed
2727          * anymore.
2728          */
2729         function createUpdates( $rev ) {
2730                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2731                 $this->mTotalAdjustment = 1;
2732                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2733                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2734         }
2735
2736         /**
2737          * Generate the navigation links when browsing through an article revisions
2738          * It shows the information as:
2739          *   Revision as of \<date\>; view current revision
2740          *   \<- Previous version | Next Version -\>
2741          *
2742          * @private
2743          * @param string $oldid         Revision ID of this article revision
2744          */
2745         function setOldSubtitle( $oldid=0 ) {
2746                 global $wgLang, $wgOut, $wgUser;
2747
2748                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2749                                 return;
2750                 }
2751
2752                 $revision = Revision::newFromId( $oldid );
2753
2754                 $current = ( $oldid == $this->mLatest );
2755                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2756                 $sk = $wgUser->getSkin();
2757                 $lnk = $current
2758                         ? wfMsg( 'currentrevisionlink' )
2759                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2760                 $curdiff = $current
2761                         ? wfMsg( 'diff' )
2762                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2763                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2764                 $prevlink = $prev
2765                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2766                         : wfMsg( 'previousrevision' );
2767                 $prevdiff = $prev
2768                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2769                         : wfMsg( 'diff' );
2770                 $nextlink = $current
2771                         ? wfMsg( 'nextrevision' )
2772                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2773                 $nextdiff = $current
2774                         ? wfMsg( 'diff' )
2775                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2776
2777                 $cdel='';
2778                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2779                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2780                         if( $revision->isCurrent() ) {
2781                         // We don't handle top deleted edits too well
2782                                 $cdel = wfMsgHtml('rev-delundel');
2783                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2784                         // If revision was hidden from sysops
2785                                 $cdel = wfMsgHtml('rev-delundel');
2786                         } else {
2787                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2788                                         wfMsgHtml('rev-delundel'),
2789                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2790                                         '&oldid=' . urlencode( $oldid ) );
2791                                 // Bolden oversighted content
2792                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2793                                         $cdel = "<strong>$cdel</strong>";
2794                         }
2795                         $cdel = "(<small>$cdel</small>) ";
2796                 }
2797                 # Show user links if allowed to see them. Normally they
2798                 # are hidden regardless, but since we can already see the text here...
2799                 $userlinks = $sk->revUserTools( $revision, false );
2800
2801                 $m = wfMsg( 'revision-info-current' );
2802                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2803                         ? 'revision-info-current'
2804                         : 'revision-info';
2805
2806                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2807
2808                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2809                 $wgOut->setSubtitle( $r );
2810         }
2811
2812         /**
2813          * This function is called right before saving the wikitext,
2814          * so we can do things like signatures and links-in-context.
2815          *
2816          * @param string $text
2817          */
2818         function preSaveTransform( $text ) {
2819                 global $wgParser, $wgUser;
2820                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2821         }
2822
2823         /* Caching functions */
2824
2825         /**
2826          * checkLastModified returns true if it has taken care of all
2827          * output to the client that is necessary for this request.
2828          * (that is, it has sent a cached version of the page)
2829          */
2830         function tryFileCache() {
2831                 static $called = false;
2832                 if( $called ) {
2833                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2834                         return;
2835                 }
2836                 $called = true;
2837                 if($this->isFileCacheable()) {
2838                         $touched = $this->mTouched;
2839                         $cache = new HTMLFileCache( $this->mTitle );
2840                         if($cache->isFileCacheGood( $touched )) {
2841                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2842                                 $cache->loadFromFileCache();
2843                                 return true;
2844                         } else {
2845                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2846                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2847                         }
2848                 } else {
2849                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2850                 }
2851         }
2852
2853         /**
2854          * Check if the page can be cached
2855          * @return bool
2856          */
2857         function isFileCacheable() {
2858                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2859                 $action    = $wgRequest->getVal( 'action'    );
2860                 $oldid     = $wgRequest->getVal( 'oldid'     );
2861                 $diff      = $wgRequest->getVal( 'diff'      );
2862                 $redirect  = $wgRequest->getVal( 'redirect'  );
2863                 $printable = $wgRequest->getVal( 'printable' );
2864                 $page      = $wgRequest->getVal( 'page' );
2865
2866                 //check for non-standard user language; this covers uselang,
2867                 //and extensions for auto-detecting user language.
2868                 $ulang     = $wgLang->getCode();
2869                 $clang     = $wgContLang->getCode();
2870
2871                 $cacheable = $wgUseFileCache
2872                         && (!$wgShowIPinHeader)
2873                         && ($this->getID() != 0)
2874                         && ($wgUser->isAnon())
2875                         && (!$wgUser->getNewtalk())
2876                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2877                         && (empty( $action ) || $action == 'view')
2878                         && (!isset($oldid))
2879                         && (!isset($diff))
2880                         && (!isset($redirect))
2881                         && (!isset($printable))
2882                         && !isset($page)
2883                         && (!$this->mRedirectedFrom)
2884                         && ($ulang === $clang);
2885
2886                 if ( $cacheable ) {
2887                         //extension may have reason to disable file caching on some pages.
2888                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2889                 }
2890
2891                 return $cacheable;
2892         }
2893
2894         /**
2895          * Loads page_touched and returns a value indicating if it should be used
2896          *
2897          */
2898         function checkTouched() {
2899                 if( !$this->mDataLoaded ) {
2900                         $this->loadPageData();
2901                 }
2902                 return !$this->mIsRedirect;
2903         }
2904
2905         /**
2906          * Get the page_touched field
2907          */
2908         function getTouched() {
2909                 # Ensure that page data has been loaded
2910                 if( !$this->mDataLoaded ) {
2911                         $this->loadPageData();
2912                 }
2913                 return $this->mTouched;
2914         }
2915
2916         /**
2917          * Get the page_latest field
2918          */
2919         function getLatest() {
2920                 if ( !$this->mDataLoaded ) {
2921                         $this->loadPageData();
2922                 }
2923                 return $this->mLatest;
2924         }
2925
2926         /**
2927          * Edit an article without doing all that other stuff
2928          * The article must already exist; link tables etc
2929          * are not updated, caches are not flushed.
2930          *
2931          * @param string $text text submitted
2932          * @param string $comment comment submitted
2933          * @param bool $minor whereas it's a minor modification
2934          */
2935         function quickEdit( $text, $comment = '', $minor = 0 ) {
2936                 wfProfileIn( __METHOD__ );
2937
2938                 $dbw = wfGetDB( DB_MASTER );
2939                 $dbw->begin();
2940                 $revision = new Revision( array(
2941                         'page'       => $this->getId(),
2942                         'text'       => $text,
2943                         'comment'    => $comment,
2944                         'minor_edit' => $minor ? 1 : 0,
2945                         ) );
2946                 $revision->insertOn( $dbw );
2947                 $this->updateRevisionOn( $dbw, $revision );
2948                 $dbw->commit();
2949
2950                 wfProfileOut( __METHOD__ );
2951         }
2952
2953         /**
2954          * Used to increment the view counter
2955          *
2956          * @static
2957          * @param integer $id article id
2958          */
2959         function incViewCount( $id ) {
2960                 $id = intval( $id );
2961                 global $wgHitcounterUpdateFreq, $wgDBtype;
2962
2963                 $dbw = wfGetDB( DB_MASTER );
2964                 $pageTable = $dbw->tableName( 'page' );
2965                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2966                 $acchitsTable = $dbw->tableName( 'acchits' );
2967
2968                 if( $wgHitcounterUpdateFreq <= 1 ) {
2969                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2970                         return;
2971                 }
2972
2973                 # Not important enough to warrant an error page in case of failure
2974                 $oldignore = $dbw->ignoreErrors( true );
2975
2976                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2977
2978                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2979                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2980                         # Most of the time (or on SQL errors), skip row count check
2981                         $dbw->ignoreErrors( $oldignore );
2982                         return;
2983                 }
2984
2985                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2986                 $row = $dbw->fetchObject( $res );
2987                 $rown = intval( $row->n );
2988                 if( $rown >= $wgHitcounterUpdateFreq ){
2989                         wfProfileIn( 'Article::incViewCount-collect' );
2990                         $old_user_abort = ignore_user_abort( true );
2991
2992                         if ($wgDBtype == 'mysql')
2993                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2994                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2995                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2996                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2997                                 'GROUP BY hc_id');
2998                         $dbw->query("DELETE FROM $hitcounterTable");
2999                         if ($wgDBtype == 'mysql') {
3000                                 $dbw->query('UNLOCK TABLES');
3001                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3002                                         'WHERE page_id = hc_id');
3003                         }
3004                         else {
3005                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3006                                         "FROM $acchitsTable WHERE page_id = hc_id");
3007                         }
3008                         $dbw->query("DROP TABLE $acchitsTable");
3009
3010                         ignore_user_abort( $old_user_abort );
3011                         wfProfileOut( 'Article::incViewCount-collect' );
3012                 }
3013                 $dbw->ignoreErrors( $oldignore );
3014         }
3015
3016         /**#@+
3017          * The onArticle*() functions are supposed to be a kind of hooks
3018          * which should be called whenever any of the specified actions
3019          * are done.
3020          *
3021          * This is a good place to put code to clear caches, for instance.
3022          *
3023          * This is called on page move and undelete, as well as edit
3024          * @static
3025          * @param $title_obj a title object
3026          */
3027
3028         static function onArticleCreate($title) {
3029                 # The talk page isn't in the regular link tables, so we need to update manually:
3030                 if ( $title->isTalkPage() ) {
3031                         $other = $title->getSubjectPage();
3032                 } else {
3033                         $other = $title->getTalkPage();
3034                 }
3035                 $other->invalidateCache();
3036                 $other->purgeSquid();
3037
3038                 $title->touchLinks();
3039                 $title->purgeSquid();
3040                 $title->deleteTitleProtection();
3041         }
3042
3043         static function onArticleDelete( $title ) {
3044                 global $wgUseFileCache, $wgMessageCache;
3045
3046                 // Update existence markers on article/talk tabs...
3047                 if( $title->isTalkPage() ) {
3048                         $other = $title->getSubjectPage();
3049                 } else {
3050                         $other = $title->getTalkPage();
3051                 }
3052                 $other->invalidateCache();
3053                 $other->purgeSquid();
3054
3055                 $title->touchLinks();
3056                 $title->purgeSquid();
3057
3058                 # File cache
3059                 if ( $wgUseFileCache ) {
3060                         $cm = new HTMLFileCache( $title );
3061                         @unlink( $cm->fileCacheName() );
3062                 }
3063
3064                 if( $title->getNamespace() == NS_MEDIAWIKI) {
3065                         $wgMessageCache->replace( $title->getDBkey(), false );
3066                 }
3067                 if( $title->getNamespace() == NS_IMAGE ) {
3068                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3069                         $update->doUpdate();
3070                 }
3071         }
3072
3073         /**
3074          * Purge caches on page update etc
3075          */
3076         static function onArticleEdit( $title ) {
3077                 global $wgDeferredUpdateList, $wgUseFileCache;
3078
3079                 // Invalidate caches of articles which include this page
3080                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3081
3082                 // Invalidate the caches of all pages which redirect here
3083                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3084
3085                 # Purge squid for this page only
3086                 $title->purgeSquid();
3087
3088                 # Clear file cache
3089                 if ( $wgUseFileCache ) {
3090                         $cm = new HTMLFileCache( $title );
3091                         @unlink( $cm->fileCacheName() );
3092                 }
3093         }
3094
3095         /**#@-*/
3096
3097         /**
3098          * Overriden by ImagePage class, only present here to avoid a fatal error
3099          * Called for ?action=revert
3100          */
3101         public function revert(){
3102                 global $wgOut;
3103                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3104         }
3105
3106         /**
3107          * Info about this page
3108          * Called for ?action=info when $wgAllowPageInfo is on.
3109          *
3110          * @public
3111          */
3112         function info() {
3113                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3114
3115                 if ( !$wgAllowPageInfo ) {
3116                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3117                         return;
3118                 }
3119
3120                 $page = $this->mTitle->getSubjectPage();
3121
3122                 $wgOut->setPagetitle( $page->getPrefixedText() );
3123                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3124                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3125
3126                 if( !$this->mTitle->exists() ) {
3127                         $wgOut->addHtml( '<div class="noarticletext">' );
3128                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3129                                 // This doesn't quite make sense; the user is asking for
3130                                 // information about the _page_, not the message... -- RC
3131                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3132                         } else {
3133                                 $msg = $wgUser->isLoggedIn()
3134                                         ? 'noarticletext'
3135                                         : 'noarticletextanon';
3136                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3137                         }
3138                         $wgOut->addHtml( '</div>' );
3139                 } else {
3140                         $dbr = wfGetDB( DB_SLAVE );
3141                         $wl_clause = array(
3142                                 'wl_title'     => $page->getDBkey(),
3143                                 'wl_namespace' => $page->getNamespace() );
3144                         $numwatchers = $dbr->selectField(
3145                                 'watchlist',
3146                                 'COUNT(*)',
3147                                 $wl_clause,
3148                                 __METHOD__,
3149                                 $this->getSelectOptions() );
3150
3151                         $pageInfo = $this->pageCountInfo( $page );
3152                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3153
3154                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3155                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3156                         if( $talkInfo ) {
3157                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3158                         }
3159                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3160                         if( $talkInfo ) {
3161                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3162                         }
3163                         $wgOut->addHTML( '</ul>' );
3164
3165                 }
3166         }
3167
3168         /**
3169          * Return the total number of edits and number of unique editors
3170          * on a given page. If page does not exist, returns false.
3171          *
3172          * @param Title $title
3173          * @return array
3174          * @private
3175          */
3176         function pageCountInfo( $title ) {
3177                 $id = $title->getArticleId();
3178                 if( $id == 0 ) {
3179                         return false;
3180                 }
3181
3182                 $dbr = wfGetDB( DB_SLAVE );
3183
3184                 $rev_clause = array( 'rev_page' => $id );
3185
3186                 $edits = $dbr->selectField(
3187                         'revision',
3188                         'COUNT(rev_page)',
3189                         $rev_clause,
3190                         __METHOD__,
3191                         $this->getSelectOptions() );
3192
3193                 $authors = $dbr->selectField(
3194                         'revision',
3195                         'COUNT(DISTINCT rev_user_text)',
3196                         $rev_clause,
3197                         __METHOD__,
3198                         $this->getSelectOptions() );
3199
3200                 return array( 'edits' => $edits, 'authors' => $authors );
3201         }
3202
3203         /**
3204          * Return a list of templates used by this article.
3205          * Uses the templatelinks table
3206          *
3207          * @return array Array of Title objects
3208          */
3209         function getUsedTemplates() {
3210                 $result = array();
3211                 $id = $this->mTitle->getArticleID();
3212                 if( $id == 0 ) {
3213                         return array();
3214                 }
3215
3216                 $dbr = wfGetDB( DB_SLAVE );
3217                 $res = $dbr->select( array( 'templatelinks' ),
3218                         array( 'tl_namespace', 'tl_title' ),
3219                         array( 'tl_from' => $id ),
3220                         'Article:getUsedTemplates' );
3221                 if ( false !== $res ) {
3222                         if ( $dbr->numRows( $res ) ) {
3223                                 while ( $row = $dbr->fetchObject( $res ) ) {
3224                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3225                                 }
3226                         }
3227                 }
3228                 $dbr->freeResult( $res );
3229                 return $result;
3230         }
3231
3232         /**
3233          * Returns a list of hidden categories this page is a member of.
3234          * Uses the page_props and categorylinks tables.
3235          *
3236          * @return array Array of Title objects
3237          */
3238         function getHiddenCategories() {
3239                 $result = array();
3240                 $id = $this->mTitle->getArticleID();
3241                 if( $id == 0 ) {
3242                         return array();
3243                 }
3244
3245                 $dbr = wfGetDB( DB_SLAVE );
3246                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3247                         array( 'cl_to' ),
3248                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3249                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3250                         'Article:getHiddenCategories' );
3251                 if ( false !== $res ) {
3252                         if ( $dbr->numRows( $res ) ) {
3253                                 while ( $row = $dbr->fetchObject( $res ) ) {
3254                                         $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3255                                 }
3256                         }
3257                 }
3258                 $dbr->freeResult( $res );
3259                 return $result;
3260         }
3261
3262         /**
3263          * Return an auto-generated summary if the text provided is a redirect.
3264          *
3265          * @param  string $text The wikitext to check
3266          * @return string '' or an appropriate summary
3267          */
3268         public static function getRedirectAutosummary( $text ) {
3269                 $rt = Title::newFromRedirect( $text );
3270                 if( is_object( $rt ) )
3271                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3272                 else
3273                         return '';
3274         }
3275
3276         /**
3277          * Return an auto-generated summary if the new text is much shorter than
3278          * the old text.
3279          *
3280          * @param  string $oldtext The previous text of the page
3281          * @param  string $text    The submitted text of the page
3282          * @return string An appropriate autosummary, or an empty string.
3283          */
3284         public static function getBlankingAutosummary( $oldtext, $text ) {
3285                 if ($oldtext!='' && $text=='') {
3286                         return wfMsgForContent('autosumm-blank');
3287                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
3288                         #Removing more than 90% of the article
3289                         global $wgContLang;
3290                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
3291                         return wfMsgForContent('autosumm-replace', $truncatedtext);
3292                 } else {
3293                         return '';
3294                 }
3295         }
3296
3297         /**
3298         * Return an applicable autosummary if one exists for the given edit.
3299         * @param string $oldtext The previous text of the page.
3300         * @param string $newtext The submitted text of the page.
3301         * @param bitmask $flags A bitmask of flags submitted for the edit.
3302         * @return string An appropriate autosummary, or an empty string.
3303         */
3304         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3305
3306                 # This code is UGLY UGLY UGLY.
3307                 # Somebody PLEASE come up with a more elegant way to do it.
3308
3309                 #Redirect autosummaries
3310                 $summary = self::getRedirectAutosummary( $newtext );
3311
3312                 if ($summary)
3313                         return $summary;
3314
3315                 #Blanking autosummaries
3316                 if (!($flags & EDIT_NEW))
3317                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
3318
3319                 if ($summary)
3320                         return $summary;
3321
3322                 #New page autosummaries
3323                 if ($flags & EDIT_NEW && strlen($newtext)) {
3324                         #If they're making a new article, give its text, truncated, in the summary.
3325                         global $wgContLang;
3326                         $truncatedtext = $wgContLang->truncate(
3327                                 str_replace("\n", ' ', $newtext),
3328                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3329                                 '...' );
3330                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
3331                 }
3332
3333                 if ($summary)
3334                         return $summary;
3335
3336                 return $summary;
3337         }
3338
3339         /**
3340          * Add the primary page-view wikitext to the output buffer
3341          * Saves the text into the parser cache if possible.
3342          * Updates templatelinks if it is out of date.
3343          *
3344          * @param string  $text
3345          * @param bool    $cache
3346          */
3347         public function outputWikiText( $text, $cache = true ) {
3348                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache;
3349
3350                 $popts = $wgOut->parserOptions();
3351                 $popts->setTidy(true);
3352                 $popts->enableLimitReport();
3353                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3354                         $popts, true, true, $this->getRevIdFetched() );
3355                 $popts->setTidy(false);
3356                 $popts->enableLimitReport( false );
3357                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3358                         $parserCache = ParserCache::singleton();
3359                         $parserCache->save( $parserOutput, $this, $wgUser );
3360                 }
3361
3362                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3363                         // templatelinks table may have become out of sync,
3364                         // especially if using variable-based transclusions.
3365                         // For paranoia, check if things have changed and if
3366                         // so apply updates to the database. This will ensure
3367                         // that cascaded protections apply as soon as the changes
3368                         // are visible.
3369
3370                         # Get templates from templatelinks
3371                         $id = $this->mTitle->getArticleID();
3372
3373                         $tlTemplates = array();
3374
3375                         $dbr = wfGetDB( DB_SLAVE );
3376                         $res = $dbr->select( array( 'templatelinks' ),
3377                                 array( 'tl_namespace', 'tl_title' ),
3378                                 array( 'tl_from' => $id ),
3379                                 'Article:getUsedTemplates' );
3380
3381                         global $wgContLang;
3382
3383                         if ( false !== $res ) {
3384                                 if ( $dbr->numRows( $res ) ) {
3385                                         while ( $row = $dbr->fetchObject( $res ) ) {
3386                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3387                                         }
3388                                 }
3389                         }
3390
3391                         # Get templates from parser output.
3392                         $poTemplates_allns = $parserOutput->getTemplates();
3393
3394                         $poTemplates = array ();
3395                         foreach ( $poTemplates_allns as $ns_templates ) {
3396                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3397                         }
3398
3399                         # Get the diff
3400                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3401
3402                         if ( count( $templates_diff ) > 0 ) {
3403                                 # Whee, link updates time.
3404                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3405
3406                                 $dbw = wfGetDb( DB_MASTER );
3407                                 $dbw->begin();
3408
3409                                 $u->doUpdate();
3410
3411                                 $dbw->commit();
3412                         }
3413                 }
3414
3415                 $wgOut->addParserOutput( $parserOutput );
3416         }
3417
3418         /**
3419          * Update all the appropriate counts in the category table, given that
3420          * we've added the categories $added and deleted the categories $deleted.
3421          *
3422          * @param $added array   The names of categories that were added
3423          * @param $deleted array The names of categories that were deleted
3424          * @return null
3425          */
3426         public function updateCategoryCounts( $added, $deleted ) {
3427                 $ns = $this->mTitle->getNamespace();
3428                 $dbw = wfGetDB( DB_MASTER );
3429
3430                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3431                 # exist, we might legitimately not create it, but it's simpler to just
3432                 # create it and then give it a negative value, since the value is bogus
3433                 # anyway.
3434                 #
3435                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3436                 $insertCats = array_merge( $added, $deleted );
3437                 if( !$insertCats ) {
3438                         # Okay, nothing to do
3439                         return;
3440                 }
3441                 $insertRows = array();
3442                 foreach( $insertCats as $cat ) {
3443                         $insertRows[] = array( 'cat_title' => $cat );
3444                 }
3445                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3446
3447                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3448                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3449                 if( $ns == NS_CATEGORY ) {
3450                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3451                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3452                 } elseif( $ns == NS_IMAGE ) {
3453                         $addFields[]    = 'cat_files = cat_files + 1';
3454                         $removeFields[] = 'cat_files = cat_files - 1';
3455                 }
3456
3457                 if ( $added ) {
3458                         $dbw->update(
3459                                 'category',
3460                                 $addFields,
3461                                 array( 'cat_title' => $added ),
3462                                 __METHOD__
3463                         );
3464                 }
3465                 if ( $deleted ) {
3466                         $dbw->update(
3467                                 'category',
3468                                 $removeFields,
3469                                 array( 'cat_title' => $deleted ),
3470                                 __METHOD__
3471                         );
3472                 }
3473         }
3474 }